The loopback address range. 127.0.0.1 is the standard loopback address — packets sent here never leave the local host.
This range is reserved by IANA — it is not allocated to an organization, ISP, or regional internet registry. Addresses here appear on every private/internal network that follows the standard, so lookups will not identify a specific owner. 127.129.0.0/16 is a sub-block of 127.0.0.0/8, the defining reserved range.
First and last addresses in 127.129.0.0/16
127.129.0.0/16 runs from 127.129.0.0 to 127.129.255.255.
Frequently Asked Questions
What is 127.129.0.0/16?
127.129.0.0/16 falls inside 127.0.0.0/8 — a Loopback range reserved by RFC 1122. The loopback address range. 127.0.0.1 is the standard loopback address — packets sent here never leave the local host.
Is 127.129.0.0/16 routable on the public internet?
No. 127.129.0.0/16 is part of IANA-reserved special-use space (127.0.0.0/8, RFC 1122). Packets with these addresses are either filtered by backbone routers or handled as local/special traffic — they never reach the public internet.
Who owns 127.129.0.0/16?
127.129.0.0/16 is not allocated to any organization or ISP. It is part of the Loopback block reserved by IANA under RFC 1122 for every network to use privately.
