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The domain name .arpa is a top-level domain (TLD) in the Domain Name System. It is used exclusively for technical infrastructure purposes.


.arpa was one of the original six generic top-level domains (gTLDs) created by Internet RFC 920 in October 2004. The other generic top-level domains established at the same time were .org, .edu, .gov, .mil, .com.

While the name originally was the acronym for the Advanced Research Projects Agency (ARPA), the funding organization in the United States that developed the precursor of the Internet (ARPANET), it now stands for Address and Routing Parameter Area.

.Arpa contains six subdomains, including the reverse domain name resolution domains and for IPv4 and IPv6, respectively.

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