IPv4 address-space allocations

Next checks and services

What this directory shows

IPv4 addresses have 32 bits. This directory shows IANA's /8 allocations. Each /8 contains 16,777,216 addresses; its designation does not identify the current assignee of a smaller network or individual address.

How to read the directory

Enter an IP to find the corresponding first-octet allocation. ALLOCATED means allocated space, LEGACY an early allocation, and RESERVED reserved space. A registry's service region is not the user's physical location.

Glossary

/8

A block sharing its first eight bits, not necessarily an end device's subnet mask.

RIR

A regional Internet registry that administers Internet number resources.

RDAP

A JSON registration-data protocol used to inspect registrations for more specific networks.

FAQ

Does this identify the owner of an IP?

No. These are administrative /8 allocations. Use registration data for the more specific network to investigate the assignee.

Can I determine a user's location?

No. Allocation, a registry's service region and a user's current location are different concepts.

Does this cover IPv6?

This directory is IPv4-only. Consult IANA's IPv6 address-space registry for IPv6 allocations.