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Top-level domain "used exclusively for Internet-infrastructure purposes." The current main purpose is for reverse-resolving IP addresses to hostnames.

Since the Internet is no longer run by ARPA, the acronym of this domain name has been retooled to stand for "Address and Routing Parameter Area."

Internet Assigned Numbers Authority. http://www.iana.org/gtld/gtld.htm. 15 Jan. 2002.