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Domain Name System

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The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network. [1]

146 relations: ACM Queue, Address space, Alternative DNS root, American Registry for Internet Numbers, Anycast, ARPANET, ASCII, Asia-Pacific Network Information Centre, Authentication, Bhavin Turakhia, BIND, Chaosnet, Circular dependency, Client–server model, Cloud computing, Cloudflare, CNAME record, Communication protocol, Comparison of DNS server software, Congressional Research Service, Content delivery network, Country code top-level domain, Data integrity, Database model, DENIC, Dig (command), Digital Equipment Corporation, Digital signature, Directory service, Distributed database, DNS hijacking, DNS management software, DNS over HTTPS, DNS over TLS, DNS root zone, DNS spoofing, DNS zone, DNS zone transfer, DNSBL, DNSCurve, Domain hijacking, Domain name, Domain name registry, Domain Name System, Domain Name System Security Extensions, DomainKeys, Dynamic DNS, Dynamic Host Configuration Protocol, Elizabeth J. Feinler, Email, ..., Email address, Email client, Email spam, Example.com, Extension mechanisms for DNS, Fault tolerance, Forward-confirmed reverse DNS, Fully qualified domain name, Generic top-level domain, GoDaddy, Google Chrome, Hesiod (name service), Hierarchy, Hostname, Hosts (file), Hotspot (Wi-Fi), ICANN, Information Sciences Institute, Internationalized domain name, Internet, Internet Engineering Task Force, Internet Explorer, Internet Protocol, Internet protocol suite, Internet service provider, Internet Society, Internet Standard, InterNIC, IP address, IP address management, IPv4, IPv6, IPv6 address, IPv6 brokenness and DNS whitelisting, Jon Postel, List of DNS record types, List of managed DNS providers, Load balancing (computing), Message transfer agent, Michael J. Karels, Microsoft, Multicast DNS, MX record, Name server, Namespace, Negative cache, Octet (computing), OpenNIC, Paul Mockapetris, Paul Vixie, Phishing, Port (computer networking), Porting, Proxy server, Public Interest Registry, Public recursive name server, Punycode, Registration Data Access Protocol, Request for Comments, Residential gateway, Resolv.conf, Reverse DNS lookup, Root name server, Round-robin DNS, Sender Policy Framework, Simple Mail Transfer Protocol, Slashdot, Split-horizon DNS, SRI International, Subdomain, Telephone directory, The Guardian, Time to live, Top-level domain, Tor (anonymity network), Transmission Control Protocol, Tree (data structure), TSIG, TXT record, Typeface, Unicode, Universal Coded Character Set, University of California, Berkeley, University of Southern California, Unix, URL, User Datagram Protocol, Verisign, Virtual hosting, Virtual private network, Web browser, WHOIS, Wildcard DNS record, Windows NT, Zone file, .arpa. Expand index (96 more) »

ACM Queue

ACM Queue is a bimonthly computer magazine founded and published by the Association for Computing Machinery (ACM).

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Address space

In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, a memory cell or other logical or physical entity.

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Alternative DNS root

The Internet uses the Domain Name System (DNS) to associate numeric computer IP addresses with human readable names.

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American Registry for Internet Numbers

The American Registry for Internet Numbers (ARIN) is the Regional Internet Registry (RIR) for Canada, the United States, and many Caribbean and North Atlantic islands.

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Anycast

Anycast is a network addressing and routing methodology in which a single destination address has multiple routing paths to two or more endpoint destinations.

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ARPANET

The Advanced Research Projects Agency Network (ARPANET) was an early packet switching network and the first network to implement the protocol suite TCP/IP.

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ASCII

ASCII, abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication.

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Asia-Pacific Network Information Centre

APNIC (the Asia-Pacific Network Information Centre) is the Regional Internet address Registry (RIR) for the Asia-Pacific region.

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Authentication

Authentication (from authentikos, "real, genuine", from αὐθέντης authentes, "author") is the act of confirming the truth of an attribute of a single piece of data claimed true by an entity.

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Bhavin Turakhia

Bhavin Turakhia (born 21 December 1979) is an Indian Entrepreneur, billionaire, CEO, and co-founder of Directi.

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BIND

BIND, or named, is the most widely used Domain Name System (DNS) software on the Internet.

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Chaosnet

Chaosnet was first developed by Thomas Knight and Jack Holloway at MIT's AI Lab in 1975 and thereafter.

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Circular dependency

In software engineering, a circular dependency is a relation between two or more modules which either directly or indirectly depend on each other to function properly.

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Client–server model

The client–server model is a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients.

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Cloud computing

Cloud computing is an information technology (IT) paradigm that enables ubiquitous access to shared pools of configurable system resources and higher-level services that can be rapidly provisioned with minimal management effort, often over the Internet.

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Cloudflare

Cloudflare, Inc. is a U.S. company that provides content delivery network services, DDoS mitigation, Internet security and distributed domain name server services, sitting between the visitor and the Cloudflare user's hosting provider, acting as a reverse proxy for websites.

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CNAME record

A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) used to specify that a domain name is an alias for another domain (the 'canonical' domain).

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Communication protocol

In telecommunication, a communication protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity.

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Comparison of DNS server software

This article presents a succinct comparison of the features, platform support, and packaging of many independent implementations of Domain Name System (DNS) name server software.

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Congressional Research Service

The Congressional Research Service (CRS), known as Congress's think tank, is a public policy research arm of the United States Congress.

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Content delivery network

A content delivery network or content distribution network (CDN) is a geographically distributed network of proxy servers and their data centers.

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Country code top-level domain

A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code.

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Data integrity

Data integrity is the maintenance of, and the assurance of the accuracy and consistency of, data over its entire life-cycle, and is a critical aspect to the design, implementation and usage of any system which stores, processes, or retrieves data.

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Database model

A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized and manipulated.

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DENIC

DENIC eG is the manager of the.de domain, the country-code top-level domain for Germany.

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Dig (command)

dig (domain information groper) is a network administration command-line tool for querying Domain Name System (DNS) servers.

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Digital Equipment Corporation

Digital Equipment Corporation, also known as DEC and using the trademark Digital, was a major American company in the computer industry from the 1950s to the 1990s.

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Digital signature

A digital signature is a mathematical scheme for presenting the authenticity of digital messages or documents.

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Directory service

In computing, directory service or name service maps the names of network resources to their respective network addresses.

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Distributed database

A distributed database is a database in which storage devices are not all attached to a common processor.

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DNS hijacking

DNS hijacking or DNS redirection is the practice of subverting the resolution of Domain Name System (DNS) queries.

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DNS management software

DNS management software is computer software that controls Domain Name System (DNS) server clusters.

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DNS over HTTPS

DNS over HTTPS (DoH) is an experimental protocol for performing remote Domain Name System (DNS) resolution via the HTTPS protocol.

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DNS over TLS

DNS over TLS is a security protocol for encrypting and wrapping Domain Name System (DNS) queries and answers via the Transport Layer Security (TLS) protocol.

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DNS root zone

The DNS root zone is the top-level DNS zone in the hierarchical namespace of the Domain Name System (DNS) of the Internet.

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DNS spoofing

DNS spoofing, also referred to as DNS cache poisoning, is a form of computer security hacking in which corrupt Domain Name System data is introduced into the DNS resolver's cache, causing the name server to return an incorrect result record, e.g. an IP address.

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DNS zone

A DNS zone is any distinct, contiguous portion of the domain name space in the Domain Name System (DNS) for which administrative responsibility has been delegated to a single manager.

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DNS zone transfer

DNS zone transfer, also sometimes known by the inducing DNS query type AXFR, is a type of DNS transaction.

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DNSBL

A Domain Name System-based Blackhole List (DNSBL) or Real-time Blackhole List (RBL) is an effort to stop email spamming.

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DNSCurve

DNSCurve is a proposed new secure protocol for the Domain Name System (DNS), designed by Daniel J. Bernstein.

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Domain hijacking

Domain hijacking or domain theft is the act of changing the registration of a domain name without the permission of its original registrant, or by abuse of privileges on domain hosting and registrar(s) software systems.

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Domain name

A domain name is an identification string that defines a realm of administrative autonomy, authority or control within the Internet.

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Domain name registry

A domain name registry is a database of all domain names and the associated registrant information in the top level domains of the Domain Name System (DNS) of the Internet that allow third party entities to request administrative control of a domain name.

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Domain Name System

The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network.

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Domain Name System Security Extensions

The Domain Name System Security Extensions (DNSSEC) is a suite of Internet Engineering Task Force (IETF) specifications for securing certain kinds of information provided by the Domain Name System (DNS) as used on Internet Protocol (IP) networks.

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DomainKeys

DomainKeys (informally DK) is a deprecated e-mail authentication system designed by Yahoo to verify the domain name of an e-mail sender and the message integrity.

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Dynamic DNS

Dynamic DNS (DDNS or DynDNS) is a method of automatically updating a name server in the Domain Name System (DNS), often in real time, with the active DDNS configuration of its configured hostnames, addresses or other information.

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Dynamic Host Configuration Protocol

The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on UDP/IP networks whereby a DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network so they can communicate with other IP networks.

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Elizabeth J. Feinler

Elizabeth Jocelyn "Jake" Feinler is an American information scientist.

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Email

Electronic mail (email or e-mail) is a method of exchanging messages ("mail") between people using electronic devices.

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Email address

An email address identifies an email box to which email messages are delivered.

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Email client

In Internet, an email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email.

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Email spam

Email spam, also known as junk email, is a type of electronic spam where unsolicited messages are sent by email.

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Example.com

example.com, example.net, example.org, and example.edu are second-level domain names reserved for documentation purposes and examples of the use of domain names.

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Extension mechanisms for DNS

Extension mechanisms for DNS (EDNS) is a specification for expanding the size of several parameters of the Domain Name System (DNS) protocol which had size restrictions that the Internet engineering community deemed too limited for increasing functionality of the protocol.

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Fault tolerance

Fault tolerance is the property that enables a system to continue operating properly in the event of the failure (or one or more faults within) some of its components.

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Forward-confirmed reverse DNS

Forward-confirmed reverse DNS (FCrDNS), also known as full-circle reverse DNS, double-reverse DNS, or iprev, is a networking parameter configuration in which a given IP address has both forward (name-to-address) and reverse (address-to-name) Domain Name System (DNS) entries that match each other.

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Fully qualified domain name

A fully qualified domain name (FQDN), sometimes also referred to as an absolute domain name,RFC 1035, Domain names: implementation and specification is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS).

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Generic top-level domain

Generic top-level domains (gTLDs) are one of the categories of top-level domains (TLDs) maintained by the Internet Assigned Numbers Authority (IANA) for use in the Domain Name System of the Internet.

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GoDaddy

GoDaddy Inc. is an American publicly traded Internet domain registrar and web hosting company.

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Google Chrome

Google Chrome is a freeware web browser developed by Google LLC.

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Hesiod (name service)

In computing, the Hesiod name service originated in Project Athena (1983–1991).

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Hierarchy

A hierarchy (from the Greek hierarchia, "rule of a high priest", from hierarkhes, "leader of sacred rites") is an arrangement of items (objects, names, values, categories, etc.) in which the items are represented as being "above", "below", or "at the same level as" one another A hierarchy can link entities either directly or indirectly, and either vertically or diagonally.

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Hostname

In computer networking, a hostname (archaically nodename) is a label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication, such as the World Wide Web.

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Hosts (file)

The computer file hosts is an operating system file that maps hostnames to IP addresses.

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Hotspot (Wi-Fi)

A hotspot is a physical location where people may obtain Internet access, typically using Wi-Fi technology, via a wireless local area network (WLAN) using a router connected to an internet service provider.

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ICANN

The Internet Corporation for Assigned Names and Numbers (ICANN) is a nonprofit organization responsible for coordinating the maintenance and procedures of several databases related to the namespaces and numericalspaces of the Internet, ensuring the network's stable and secure operation.

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Information Sciences Institute

The USC Information Sciences Institute (ISI) is a component of the University of Southern California (USC) Viterbi School of Engineering, and specializes in research and development in information processing, computing, and communications technologies.

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Internationalized domain name

An internationalized domain name (IDN) is an Internet domain name that contains at least one label that is displayed in software applications, in whole or in part, in a language-specific script or alphabet, such as Arabic, Chinese, Cyrillic, Tamil, Hebrew or the Latin alphabet-based characters with diacritics or ligatures, such as French.

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Internet

The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.

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Internet Engineering Task Force

The Internet Engineering Task Force (IETF) develops and promotes voluntary Internet standards, in particular the standards that comprise the Internet protocol suite (TCP/IP).

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Internet Explorer

Internet Explorer (formerly Microsoft Internet Explorer and Windows Internet Explorer, commonly abbreviated IE or MSIE) is a series of graphical web browsers developed by Microsoft and included in the Microsoft Windows line of operating systems, starting in 1995.

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Internet Protocol

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries.

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Internet protocol suite

The Internet protocol suite is the conceptual model and set of communications protocols used on the Internet and similar computer networks.

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Internet service provider

An Internet service provider (ISP) is an organization that provides services for accessing, using, or participating in the Internet.

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Internet Society

The Internet Society (ISOC) is an American non-profit organization founded in 1992 to provide leadership in Internet-related standards, education, access, and policy.

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Internet Standard

In computer network engineering, an Internet Standard is a normative specification of a technology or methodology applicable to the Internet.

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InterNIC

The Network Information Center (NIC), also known as InterNIC from 1993 until 1998, was the organization primarily responsible for Domain Name System (DNS) domain name allocations and X.500 directory services.

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IP address

An Internet Protocol address (IP address) is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.

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IP address management

IP address management (IPAM) is software that can plan, track, and manage the IP addresses used in a computer network.

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IPv4

Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP).

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IPv6

Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet.

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IPv6 address

An Internet Protocol Version 6 address (IPv6 address) is a numerical label that is used to identify a network interface of a computer or a network node participating in an IPv6 computer network.

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IPv6 brokenness and DNS whitelisting

In the field of IPv6 deployment, IPv6 brokenness was bad behavior seen in early tunneled or dual stack IPv6 deployments where unreliable or bogus IPv6 connectivity is chosen in preference to working IPv4 connectivity.

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Jon Postel

Jonathan Bruce Postel (August 6, 1943 – October 16, 1998) was an American computer scientist who made many significant contributions to the development of the Internet, particularly with respect to standards.

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List of DNS record types

This list of DNS record types is an overview of resource records (RRs) permissible in zone files of the Domain Name System (DNS).

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List of managed DNS providers

This is a list of Managed DNS providers in a comparison table.

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Load balancing (computing)

In computing, load balancing improves the distribution of workloads across multiple computing resources, such as computers, a computer cluster, network links, central processing units, or disk drives.

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Message transfer agent

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture.

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Michael J. Karels

Michael J. (Mike) Karels is an American Software Engineer and one of the key people in history of BSD UNIX.

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Microsoft

Microsoft Corporation (abbreviated as MS) is an American multinational technology company with headquarters in Redmond, Washington.

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Multicast DNS

In computer networking, the multicast DNS (mDNS) protocol resolves host names to IP addresses within small networks that do not include a local name server.

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MX record

A mail exchanger record (MX record) is a type of certified and verified resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain, and a preference value used to prioritize mail delivery if multiple mail servers are available.

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Name server

A name server is a computer application that implements a network service for providing responses to queries against a directory service.

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Namespace

In computing, a namespace is a set of symbols that are used to organize objects of various kinds, so that these objects may be referred to by name.

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Negative cache

In computer programming, negative cache is a cache that also stores "negative" responses, i.e. failures.

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Octet (computing)

The octet is a unit of digital information in computing and telecommunications that consists of eight bits.

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OpenNIC

OpenNIC (also referred to as the OpenNIC Project) is a user-owned and -controlled top-level Network Information Center that offers a non-national alternative to traditional Top-Level Domain (TLD) registries such as ICANN.

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Paul Mockapetris

Paul V. Mockapetris (born 1948 in Boston, Massachusetts, US) is an American computer scientist and Internet pioneer, who, together with Jon Postel, invented the Internet Domain Name System (DNS).

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Paul Vixie

Paul Vixie is an American computer scientist whose technical contributions include Domain Name System (DNS) protocol design and procedure, mechanisms to achieve operational robustness of DNS implementations, and significant contributions to open source software principles and methodology.

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Phishing

Phishing is the fraudulent attempt to obtain sensitive information such as usernames, passwords, and credit card details (and money), often for malicious reasons, by disguising as a trustworthy entity in an electronic communication.

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Port (computer networking)

In computer networking, a port is an endpoint of communication in an operating system, which identifies a specific process or a type of network service running on that system.

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Porting

In software engineering, porting is the process of adapting software for the purpose of achieving some form of execution in a computing environment that is different from the one that a given program (meant for such execution) was originally designed for (e.g. different CPU, operating system, or third party library).

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Proxy server

In computer networks, a proxy server is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers.

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Public Interest Registry

Public Interest Registry is a Reston, Virginia-based not-for-profit created by the Internet Society (ISOC) in 2002 to manage the.org top-level domain.

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Public recursive name server

A public recursive name server is a name server that networked computers may use for Internet directory services in place of or in addition to name servers belonging to the Internet service providers to which the devices are connected.

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Punycode

Punycode is a representation of Unicode with the limited ASCII character subset used for Internet host names.

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Registration Data Access Protocol

The Registration Data Access Protocol (RDAP) is a computer network communications protocol standardized by a working group at the Internet Engineering Task Force in 2015, after experimental developments and thorough discussions.

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Request for Comments

In information and communications technology, a Request for Comments (RFC) is a type of publication from the technology community.

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Residential gateway

In telecommunications networking, a residential gateway (more commonly known as a home router or home gateway) is a device that allows a local area network (LAN) to connect to a wide area network (WAN) via a modem.

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Resolv.conf

resolv.conf is the name of a computer file used in various operating systems to configure the system's Domain Name System (DNS) resolver.

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Reverse DNS lookup

In computer networks, a reverse DNS lookup or reverse DNS resolution (rDNS) is the querying of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name.

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Root name server

A root name server is a name server for the root zone of the Domain Name System (DNS) of the Internet.

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Round-robin DNS

Round Robin DNS is a technique of load distribution, load balancing, or fault-tolerance provisioning multiple, redundant Internet Protocol service hosts, e.g., Web server, FTP servers, by managing the Domain Name System's (DNS) responses to address requests from client computers according to an appropriate statistical model.

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Sender Policy Framework

Sender Policy Framework (SPF) is an email validation protocol designed to detect and block email spoofing by providing a mechanism to allow receiving mail exchangers to verify that incoming mail from a domain comes from an IP Address authorized by that domain's administrators. The list of authorized sending hosts and IP addresses for a domain is published in the Domain Name System (DNS) records for that domain in the form of a specially formatted TXT record.

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Simple Mail Transfer Protocol

Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission.

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Slashdot

Slashdot (sometimes abbreviated as /.) is a social news website that originally billed itself as "News for Nerds.

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Split-horizon DNS

In computer networking, split-horizon DNS, split-view DNS, split-brain DNS, or split DNS is the facility of a Domain Name System (DNS) implementation to provide different sets of DNS information, usually selected by the source address of the DNS request.

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SRI International

SRI International (SRI) is an American nonprofit research institute headquartered in Menlo Park, California.

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Subdomain

In the Domain Name System (DNS) hierarchy, a subdomain is a domain that is a part of a main domain.

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Telephone directory

A telephone directory, also known as a telephone book, telephone address book, phone book, or the white/yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory.

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The Guardian

The Guardian is a British daily newspaper.

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Time to live

Time to live (TTL) or hop limit is a mechanism that limits the lifespan or lifetime of data in a computer or network.

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Top-level domain

A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet.

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Tor (anonymity network)

Tor is free software for enabling anonymous communication.

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Transmission Control Protocol

The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite.

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Tree (data structure)

In computer science, a tree is a widely used abstract data type (ADT)—or data structure implementing this ADT—that simulates a hierarchical tree structure, with a root value and subtrees of children with a parent node, represented as a set of linked nodes.

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TSIG

TSIG (Transaction SIGnature) is a computer-networking protocol defined in RFC 2845.

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TXT record

A TXT record (short for text record) is a type of resource record in the Domain Name System (DNS) used to provide the ability to associate arbitrary text with a host or other name, such as human readable information about a server, network, data center, or other accounting information.

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Typeface

In typography, a typeface (also known as font family) is a set of one or more fonts each composed of glyphs that share common design features.

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Unicode

Unicode is a computing industry standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems.

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Universal Coded Character Set

The Universal Coded Character Set (UCS) is a standard set of characters defined by the International Standard ISO/IEC 10646, Information technology — Universal Coded Character Set (UCS) (plus amendments to that standard), which is the basis of many character encodings.

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University of California, Berkeley

The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public research university in Berkeley, California.

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University of Southern California

The University of Southern California (USC or SC) is a private research university in Los Angeles, California.

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Unix

Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.

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URL

A Uniform Resource Locator (URL), colloquially termed a web address, is a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it.

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User Datagram Protocol

In computer networking, the User Datagram Protocol (UDP) is one of the core members of the Internet protocol suite.

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Verisign

Verisign, Inc. is an American company based in Reston, Virginia, United States that operates a diverse array of network infrastructure, including two of the Internet's thirteen root nameservers, the authoritative registry for the,, and generic top-level domains and the and country-code top-level domains, and the back-end systems for the,, and top-level domains.

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Virtual hosting

Virtual hosting is a method for hosting multiple domain names (with separate handling of each name) on a single server (or pool of servers).

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Virtual private network

A virtual private network (VPN) extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.

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Web browser

A web browser (commonly referred to as a browser) is a software application for accessing information on the World Wide Web.

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WHOIS

WHOIS (pronounced as the phrase "who is") is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block or an autonomous system, but is also used for a wider range of other information.

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Wildcard DNS record

A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names.

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Windows NT

Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993.

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Zone file

A Domain Name System (DNS) zone file is a text file that describes a DNS zone.

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.arpa

The domain name arpa is a top-level domain (TLD) in the Domain Name System of the Internet.

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Redirects here:

Address resolution mechanism, Authoritative answer, D.N.S., DNS, DNS (computing), DNS Protocol, DNS Resolvers, DNS System, DNS error, DNS label, DNS name, DNS propagation, DNS query, DNS record, DNS resolver, DNS resolvers, Dns, Domain Name Service, Domain Name Services, Domain Name System/version 2, Domain Propagation, Domain name service, Domain name services, Domain name system, Domain namespace, Domain propagation, Glue record, Glue records, Port 53, RRset, Recursive DNS resolver, Resolver (DNS), Resource record.

References

[1] https://en.wikipedia.org/wiki/Domain_Name_System

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