• Source: .arpa

The domain name arpa is a top-level domain (TLD) in the Domain Name System (DNS) of the Internet. It is used predominantly for the management of technical network infrastructure. Prominent among such functions are the subdomains in-addr.arpa and ip6.arpa, which provide namespaces for reverse DNS lookup of IPv4 and IPv6 addresses, respectively.
The name originally was the acronym for the Advanced Research Projects Agency (ARPA), the funding organization in the United States that developed the ARPANET, the precursor of the Internet. It was the first domain defined for the network in preparation for a hierarchical naming system for the delegation of authority, autonomy, and responsibility. It was originally intended only to serve in a temporary function for facilitating the systematic naming of the ARPANET computers. However, it became practically difficult to remove the domain after infrastructural uses had been sanctioned. As a result, the name was redefined as the backronym Address and Routing Parameter Area.
Domain-name registrations in arpa are not possible, and new subdomains are infrequently added by the Internet Engineering Task Force.




Purpose


Each computer using the Internet Protocol is identified by a numerical IP address for identification and location addressing. Each host is also assigned a more memorable hostname, which often relates to the purpose or ownership of the host, and is used more conveniently in user interaction with network functions, such as when connecting to or accessing a resource. Originally, the mapping between names and addresses was a cumbersome mechanical process using lookup tables distributed as computer files between network administrators. The Domain Name System (DNS) solved this inefficiency by automating the lookup function with a hierarchical naming system using domain names. When a user requests a network service using a domain name, the protocol implementation (protocol stack) translates the name to an address that can be used to reach a remote host.
This naming function, often called forward resolution, was the original purpose of the top-level domain "ARPA". It was the first domain defined in the first naming system of the nascent Internet, and was supposed to be an initial container domain for all then-existing ARPANET hosts. The next stage of development of the naming architecture foresaw the establishment of specific domains for other purposes based on certain requirements.




= Reverse IP address mapping

=
In many applications the reverse of the name-to-address mapping is also required. The host receiving a service request may require the domain name of the originating computer, for example, to customize the service, or for verification purposes. This latter function, called Reverse DNS lookup, is implemented in the major uses of the domain arpa: its subdomains in-addr.arpa for Internet Protocol version 4, and ip6.arpa for IPv6.
Conceptually similar lookup and mapping functionality is provided by other subdomains of arpa for specific types of data.




= Telephone number mapping

=
The domain e164.arpa provides a lookup function that retrieves information associated with telephone numbers through the ENUM service. This service may be used to obtain the name of a computer that is capable of routing telecommunication requests for a registered telephone number, or obtain an email address to contact the subscriber of a specific telephone number.




= Residential networking

=
The domain name home.arpa was reserved by the Internet Engineering task force in May 2018 as a special-use domain name for non-unique DNS services in residential networking, to avoid the use of the top-level domain home., which would require DNSSEC signatures. In addition, the use of home. led to domain name leakage to the Internet root name servers. The authoritative name servers for home.arpa intercept locally unresolved queries for the domain and return addresses for certain blackhole servers.




History


The ARPANET, named for the Advanced Research Projects Agency (ARPA), was launched in 1969, and is considered the earliest predecessor of the Internet. The agency's name was adopted as the name for the first formal name space of the network after it had transitioned to TCP/IP networking in January 1983. The name was used as a naming suffix for all then-existing ARPANET hosts. Hierarchical domain-style names were intended to support delegation of responsibility and authority for adding future hosts to the network.
With the formal development of such a hierarchical naming system, the domain also became one of the inaugural members of a set of domain names for specific types of network members, namely com for commercial users, org for organizations, edu for educational institutions, gov for government entities, and mil for networks of the United States military.
It was expected that the use of arpa would be temporary and that the existing systems would be migrated to other domains. But arpa also provided e-mail addresses associated with the Network Information Center, which administered the naming system. After serving the transitional purpose, it proved impractical to remove the domain. The domain in-addr.arpa had been installed for reverse DNS lookup of IP addresses.
Originally, the IETF intended that new infrastructure databases would be created in the top-level domain int. In May 2000, this policy was reversed and it was decided that the top-level domain int should be restricted to use by international organizations. Arpa was retained for its long-standing purpose, but its full name was changed to the Address and Routing Parameter Area, making the zone name a backronym. Registrations of internet infrastructure services in .int made prior to this policy change, were optionally grandfathered in and not required to move to .arpa.
In March 2010, zone arpa was secured with digital signatures within the Domain Name System Security Extensions (DNSSEC).




Subdomains


Subdomains of arpa are created by resolution in the work groups of the Internet Engineering Task Force via the Request for Comments process, and are maintained by the Internet Assigned Numbers Authority (IANA). The DNS zone arpa has the following subdomains:




References






External links


arpa. zone file
• Source: ARPA

Arpa or ARPA may refer to:




Given name


Arpa Ke'un (died 1336), Ilkhan during the disintegration of the Mongol state in Persia




Surname


José Arpa (1858–1952), Spanish artist who worked in Spain, Mexico, and Texas
Okay Arpa (born 1977), Turkish karateka
Yvan Arpa, Swiss watch designer




Geographical names


Areni, formerly Arpa, a village in Armenia
Arpi, Armenia, also known as Arpa, a town in Armenia
Arpa (river), in Armenia
Arpa (river), Chhattisgarh in Chhattisgarh, India
Akhurian River, Arpa in Turkish, river in Turkey and Armenia
Arpa Darreh, a village in Iran
Arpa Valley, a high-altitude valley in Kyrgyzstan




Music


Arpa d'Eolo, a musical instrument
Arpa jarocha, a Mexican harp used in conjunto jarocho music
Rinaldo dall'Arpa (died 1603), Italian composer, singer, and harpist




Acronym


Advanced Research Projects Agency, former name of the US Defense Advanced Research Projects Agency
ARPA-E, the Advanced Research Projects Agency-Energy, an agency created in 2007 within the US Department of Energy
ARPA-H, the Advanced Research Projects Agency for Health, an organization created in 2022 within the US National Institutes of Health
ARPA-I, the Advanced Research Projects Agency for Infrastructure, an organization created in 2022 within the US Department of Transportation
HSARPA, the Homeland Security Advanced Research Projects Agency, an agency within the Science and Technology Directorate at the US Department of Homeland Security
IARPA, the Intelligence Advanced Research Projects Activity, an organization within the US Office of the Director of National Intelligence
.arpa (address and routing parameter area), a top-level domain in the Domain Name System of the Internet
Aerolíneas Paraguayas, a former Paraguayan airline
Agenzie Regionali per la Protezione Ambientale, the Italian Regional Environmental Protection Agency
Amazon Region Protected Areas Program, an initiative to expand protection of the Amazon rainforest in Brazil
American Rescue Plan Act of 2021, an economic stimulus program of the United States
Archaeological Resources Protection Act of 1979, a federal law of the United States
Arctic Research and Policy Act of 1984 (amended 1990)
Automatic radar plotting aid, a capability of some marine radar systems
Average revenue per account, a metric similar to average revenue per user




Other uses


Arpa Yeghegnadzor, an inactive Armenian football club
Arpa şehriye, Turkish for orzo




See also


Biomedical Advanced Research and Development Authority (BARDA)
Arpa Chai (disambiguation)
All pages with titles beginning with ARPA
All pages with titles containing ARPA

Kata Kunci Pencarian:

• ARPANET
• Sejarah Internet
• DARPA
• Ranah internet tingkat teratas
• Unix
• DAMP Project
• Sekolah Tinggi Ilmu Pelayaran Jakarta
• Jembatan Assut de l'Or
• Simple Mail Transfer Protocol
• Internet
• .arpa
• ARPA
• Harp
• ARPA-E
• Reverse DNS lookup
• Arpa jarocha
• Arpa Ke'un
• ARPANET
• DARPA
• Advanced Research Projects Agency for Health