Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.54.80.0/24 | 256 | RIPE NCC |  DE | 22nd May 1989 |
| 192.54.81.0/24 | 256 | ARIN |  US | 2nd Apr 2026 |
| 192.54.82.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.54.83.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.54.84.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.54.85.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.54.86.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.54.87.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.54.88.0/24 | 256 | ARIN | US | 31st May 1989 |
| 192.55.0.0/24 | 256 | ARIN | US | 29th Aug 2014 |
| 192.55.1.0/24 | 256 | ARIN | US | 23rd Jun 1989 |
| 192.55.102.0/24 | 256 | ARIN | US | 17th Jul 1989 |
| 192.55.105.0/24 | 256 | RIPE NCC |  NL | 19th Jul 1989 |
| 192.55.107.0/24 | 256 | ARIN | US | 20th Jul 1989 |
| 192.55.111.0/24 | 256 | ARIN | US | 21st Jul 1989 |
| 192.55.113.0/24 | 256 | ARIN | US | 24th Jul 1989 |
| 192.55.115.0/24 | 256 | RIPE NCC | NL | 28th Jul 1989 |
| 192.55.118.0/24 | 256 | APNIC |  JP | 31st Jul 1989 |
| 192.55.121.0/24 | 256 | ARIN | US | 31st Jul 1989 |
| 192.55.122.0/23 | 512 | ARIN | US | 1st Aug 1989 |
| 192.55.124.0/24 | 256 | ARIN | US | 1st Aug 1989 |
| 192.55.125.0/24 | 256 | ARIN | US | 2nd Aug 1989 |
| 192.55.126.0/24 | 256 | ARIN | US | 2nd Aug 1989 |
| 192.55.127.0/24 | 256 | ARIN | US | 2nd Aug 1989 |
| 192.55.129.0/24 | 256 | RIPE NCC | NL | 3rd Aug 1989 |
| 192.55.130.0/24 | 256 | ARIN |  CA | 9th Sept 2014 |
| 192.55.131.0/24 | 256 | ARIN | US | 3rd Aug 1989 |
| 192.55.132.0/24 | 256 | RIPE NCC |  GB | 4th Aug 1989 |
| 192.55.135.0/24 | 256 | ARIN | US | 7th Aug 1989 |
| 192.55.136.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 192.55.187.0/24 | 256 | ARIN | US | 8th Aug 1989 |
| 192.55.189.0/24 | 256 | ARIN | US | 8th Aug 1989 |
| 192.55.194.0/24 | 256 | ARIN | CA | 15th Aug 1989 |
| 192.55.196.0/24 | 256 | ARIN | US | 16th Aug 1989 |
| 192.55.197.0/24 | 256 | RIPE NCC | DE | 16th Aug 1989 |
| 192.55.198.0/24 | 256 | APNIC |  AU | 16th Aug 1989 |
| 192.55.199.0/24 | 256 | ARIN | US | 17th Aug 1989 |
| 192.55.200.0/24 | 256 | ARIN | US | 12th Sept 2014 |
| 192.55.201.0/24 | 256 | ARIN | US | 22nd Aug 1989 |
| 192.55.202.0/24 | 256 | ARIN | US | 22nd Aug 1989 |
| 192.55.203.0/24 | 256 | ARIN | US | 22nd Aug 1989 |
| 192.55.204.0/24 | 256 | ARIN | US | 22nd Aug 1989 |
| 192.55.206.0/24 | 256 | ARIN | CA | 22nd Aug 1989 |
| 192.55.207.0/24 | 256 | ARIN | US | 23rd Aug 1989 |
| 192.55.212.0/24 | 256 | RIPE NCC | GB | 24th Aug 1989 |
| 192.55.213.0/24 | 256 | ARIN | US | 30th Aug 1989 |
| 192.55.214.0/24 | 256 | ARIN | US | 29th Aug 1989 |
| 192.55.218.0/24 | 256 | ARIN | US | 30th Aug 1989 |
| 192.55.22.0/23 | 512 | ARIN | US | 26th Jun 1989 |
| 192.55.221.0/24 | 256 | ARIN | US | 29th Aug 1989 |