Infrastructure TLD (.arpa)

The infrastructure [[tld|TLD]] is a special-purpose top-level domain reserved exclusively for technical use by the internet's core infrastructure. .arpa (Address and Routing Parameter Area) is the only infrastructure TLD, managed by [[iana|IANA]] on behalf of the [[icann|ICANN]] community. It hosts reverse [[dns|DNS]] lookup zones (in-addr.arpa for IPv4, ip6.arpa for IPv6) and other protocol-essential namespaces. Unlike all other TLDs, .arpa is never used for public website addresses and cannot be registered by individuals or organizations.