IPv4 address-space allocations
Find the large allocation blocks and administrators of IPv4 address space.
Instructions, guides and related tools
Source: IANA · Retrieved (UTC): · Source updated: 2025-10-10
Results
256 matches out of 256 · 241–256
| Block | Designation | Status | Allocation date | WHOIS server |
|---|---|---|---|---|
| 240.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 241.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 242.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 243.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 244.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 245.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 246.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 247.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 248.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 249.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 250.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 251.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 252.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 253.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 254.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
| 255.0.0.0/8 | Future use | RESERVED | 1981-09 | — |
These are IANA allocation and administration records, not user locations, domain availability or registration prices.
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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.
Updated:
