The top-level domain (TLD) “.arpa” has a unique and critical role within the internet’s Domain Name System (DNS). The DNS translates web domain names into their corresponding IP addresses to help computers communicate effectively over networks.
The “.arpa” TLD is an acronym for “Address and Routing Parameter Area”. This top-level domain is entirely managed by the Internet Architecture Board (IAB), under the supervision of Internet Corporation for Assigned Names and Numbers (ICANN), and it’s used exclusively for internet infrastructure purposes. Notably, it is one of the first established TLDs and has remained as the standard necessary for internet functionality.
Now, let’s delve deeper into the specifics and uses of the “.arpa” TLD.
The ‘.arpa’ domain space is divided into different ‘sub-domains.’ For instance, the ‘in-addr.arpa’ subdomain, which supports the translation of IP addresses into domain names. This process, known as reverse DNS lookup, is essential for certain network services and security checks. Another important subdomain is ‘ipv6.arpa,’ for reverse DNS lookup of IPv6 addresses.
The e164.arpa domain is another interesting use case for the .arpa TLD. It is used in conjunction with ENUM, a protocol translating telephone numbers into Uniform Resource Identifier (URI) formats.
It’s important to mention that the ‘.arpa’ TLD is not intended for general use, but rather for technical internet infrastructure operations. Unlike other TLDs like ‘.com’ or ‘.org,’ you cannot register a ‘.arpa’ domain for personal or business use.
Sources such as ICANN (Internet Corporation for Assigned Names and Numbers), IANA (Internet Assigned Numbers Authority), and RFC 3172, a document from the Internet Engineering Task Force (IETF), provide detailed insights about “.arpa” standing as a “special use” TLD. In addition, the Internet Society has released relevant information around the topic.
While the ‘.arpa’ TLD may not have the same visibility as ‘.com’ or ‘.org,’ it continues to play a crucial role in the infrastructure of the Internet. Due to its specialized use, it could be considered as one of the backbone elements of the Internet that helps keep it functional and efficient.
Sources:
1. Internet Corporation for Assigned Names and Numbers (ICANN)
2. Internet Assigned Numbers Authority (IANA)
3. Internet Engineering Task Force – RFC 3172
4. Internet Society
5. Understanding the Domain Name System: “.ARPA” – RIPE Network Coordination Centre.
