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IANA IPv4 Address Space Allocation for Prefix 127/8

Designation

IANA - Loopback

Allocation Time

September 1981

Status

RESERVED - designated by the IETF (Internet Engineering Task Force) for specific non-global-unicast purposes as noted.

Notes

127.0.0.0/8 reserved for Loopback [RFC1122], section 3.2.1.3. Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv4-special-registry].