NationMaster - Encyclopedia: .arpa

.arpa is an Internet top-level domain (TLD) used exclusively for Internet-infrastructure purposes. 1985 (MCMLXXXV) was a common year starting on Tuesday of the Gregorian calendar. ... For other uses of IANA, see IANA (disambiguation). ... The Internet Architecture Board (IAB) is the committee charged with oversight of the technical and engineering development of the Internet by the Internet Society (ISOC). ... The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development of new technology for use by the military. ... A top-level domain (TLD) is the last part of an Internet domain name; that is, the letters which follow the final dot of any domain name. ...

The .arpa TLD was originally intended to be a temporary measure to facilitate the transition to the Domain Name System. The ARPANET was the predecessor to the Internet established by the United States Department of Defense Advanced Research Projects Agency (ARPA), and when the Domain Name System was introduced in 1985, ARPANET host names were initially converted to domain names by adding .arpa to the end. Hostnames in other networks were also sometimes converted to pseudo-domain-style addresses by adding endings such as .uucp and .bitnet, though these were never added to the Internet root as formal TLDs. Domain names of this form were rapidly phased out by replacing them with domain names using the other, more informative, TLDs. The domain name system (DNS) stores and associates many types of information with domain names, but most importantly, it translates domain names (computer hostnames) to IP addresses. ... ARPANET logical map, March 1977. ... The United States Department of Defense, abbreviated as DoD or DOD and sometimes called the Defense Department, is a civilian Cabinet organization of the United States government. ... The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development of new technology for use by the military. ... 1985 (MCMLXXXV) was a common year starting on Tuesday of the Gregorian calendar. ... .uucp was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways. ... .bitnet was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways. ...

However, deleting .arpa once it had served its transitional purpose proved to be impractical, because in-addr.arpa was used for reverse DNS lookup for IP addresses. For example the IP address 145.97.39.155 is mapped to a host name by issuing a DNS query for the PTR record for the special host name 155.39.97.145.in-addr.arpa. Reverse DNS lookup is a process to determine the hostname associated with a given IP address. ... An IP address (Internet Protocol address) is a unique address that devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard (IP)â€”in simpler terms, a computer address. ... The Domain Name System or DNS is a system that stores information about host names and domain names in a kind of distributed database on networks, such as the Internet. ...

At one time, it was intended that new infrastructure databases be created in .int, with a view to eventually deleting .arpa. However, in May 2000 this policy was reversed, and it was decided that .arpa should be retained for this purpose, and .int should be retained solely for the use of international organizations. In accordance with this new policy, .arpa now officially stands for Address and Routing Parameter Area (a "backronym"). .int is a generic top-level domain (gTLD) used on the Internets Domain Name System. ... This article is about the year 2000. ... A backronym or bacronym is a type of acronym that begins as an ordinary word, and is later interpreted as an acronym. ...

Second-level domains

-1... Reverse DNS lookup is a process to determine the hostname associated with a given IP address. ... Internet Protocol version 4 is the fourth iteration of the Internet Protocol (IP) and it is the first version of the protocol to be widely deployed. ... The Cross Registry Information Service Protocol, or CRISP, is a computer network communications protocol which has been in development by a working group at the Internet Engineering Task Force since 2004. ... Reverse DNS lookup is a process to determine the hostname associated with a given IP address. ... Internet Protocol version 6 (IPv6) is a network layer IP standard used by electronic devices to exchange data across a packet-switched internetwork. ... A Uniform Resource Identifier (URI), is a compact string of characters used to identify or name a resource. ... A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the urn scheme, and does not imply availability of the identified resource. ...

External links

Category: Generic top-level domains The domain name system (DNS) stores and associates many types of information with domain names, but most importantly, it translates domain names (computer hostnames) to IP addresses. ... A generic top-level domain (gTLD) is a top-level domain used (at least in theory) by a particular class of organization. ... .biz is a generic top-level domain intended for domains to be used by businesses; the name is a phonetic spelling of the first syllable of business. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... .edu (education) is the generic top-level domain for educational institutions, primarily those in the United States. ... .gov is the generic top-level domain used by the United States federal government. ... .info is a generic top-level domain intended for informative websites, although its use is not restricted. ... .int is a generic top-level domain (gTLD) used on the Internets Domain Name System. ... .mil is the generic top-level domain for the United States Department of Defense and its subsidiary organizations. ... .name is a generic top-level domain (gTLD) intended for the use of individuals. ... .net is a generic top-level domain (gTLD) used on the Internets Domain Name System. ... .org (organization) is a generic top-level domain (gTLD) used in the Internets Domain Name System. ... A sponsored top-level domain is a generic top-level domain proposed by an independent agency, with that agency establishing and enforcing rules restricting the eligibility of registrants to use the TLD. For example, the . ... .aero is a generic top-level domain (gTLD) used on the Internets Domain Name System. ... .cat is a top-level domain submitted to ICANN for approval as a sponsored TLD. It would be used to highlight Catalan language and culture. ... .coop is a generic top-level domain intended for the use of cooperatives. ... .jobs is a top-level domain approved by ICANN on April 8, 2005 as a sponsored TLD as part of the second group of new TLD applications submitted in 2004. ... .mobi is a top-level domain approved by ICANN as a sponsored TLD. It will be restricted to mobile devices and sites providing services for them on the Mobile Web. ... .museum is a generic top-level domain (gTLD) used exclusively by museums, museum associations, and individual members of the museum profession, as these groups are defined by the International Council of Museums (ICOM). ... .pro is a generic top-level domain for professionals. ... .travel is a top-level domain approved by ICANN as a sponsored TLD in the second group of new TLD applications evaluated in 2004. ... . The initial letter is shown capitalized due to technical restrictions. ... .asia is a generic top-level domain proposed by the DotAsia Organization, with the back-end registry to be operated by Afilias. ... .tel is a top-level domain submitted to ICANN for approval as a sponsored TLD. It would be restricted to internet communication services, and provide a supplement to the traditional numeric namespace for telecommunication services (i. ... .cym (dotCYM) is a proposed top-level domain for sites written in the Welsh language. ... .geo is a generic top-level domain proposed by SRI International to be used to associate Internet resources with geographical locations, via a system of georegistrars and georegistries with hierarchical addresses representing locations in a grid encircling the Earth. ... .kid is a generic top-level domain proposed by the European Parliament for webites designed for children, and would be monitored by an independent authority. ... .kids is a proposed top-level domain that its supporters hope would deter the spread of pornography to minors. ... .mail is a generic top-level domain proposed by Spamhaus, but unapproved by ICANN. It would attempt to reduce the spam problem by creating addresses which have been authenticated as not belonging to spammers, and with verified contact information, paralleling the actual addresses (in other TLDs) of servers used to... .post is Top-level domain submitted to ICANN for approval as a sponsored TLD. It would be restricted to the use of national and regional postal services, and private businesses that provide similar services. ... .sco (dotSCO) is a proposed top-level domain. ... .web is a generic top-level domain operated as an alternative registry, not in the official root, by Image Online Design since 1995. ... .xxx is a proposed top level domain (TLD) intended as a voluntary option for sexually explicit sites on the Internet. ... .nato is a former Internet top-level domain. ... .example is a reserved top-level domain not intended for real use in the global DNS. It was defined in June 1999 by RFC 2606, along with . ... jhjhjh ... .localhost is a Reserved top-level domain never intended for actual use in the global DNS. Its reservation is to avoid misuse with the common localhost See also Reserved top-level domains RFC2606 - Reserved domains list and information Generic top-level domains .aero . ... .test is a Reserved top-level domain never intended for actual use in the global DNS. It was not one of the original top-level domains established in 1985. ... A number of pseudo top-level domains to be used in naming computers have been defined at various times. ... .bitnet was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways. ... .csnet was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways. ... .local is a domain used by Apple Computers Bonjour protocol. ... .onion is a pseudo-domain-style address suffix (similar in concept to such endings as . ... .uucp was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways. ... In addition to the Internets main DNS root (currently consisting of 13 nominal root nameservers working in agreement with ICANN), several organizations operate alternative DNS roots (often referred to as alt roots). ... A country code top-level domain (ccTLD) is a top-level domain used and reserved for a country or a dependent territory. ...