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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.166.36.0/24 | 256 | RIPE NCC |  IR | 6th Feb 2026 |
| 192.166.39.0/24 | 256 | RIPE NCC |  FR | 9th Feb 2026 |
| 192.166.49.0/24 | 256 | RIPE NCC |  DE | 7th May 1992 |
| 192.166.50.0/23 | 512 | RIPE NCC | DE | 7th May 1992 |
| 192.166.52.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.53.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.54.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.55.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.80.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.88.0/21 | 2k | RIPE NCC | DE | 7th May 1992 |
| 192.175.32.0/24 | 256 | RIPE NCC |  FI | 1st Jan 1984 |
| 192.175.33.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.175.34.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.175.35.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.175.36.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.175.44.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.175.45.0/24 | 256 | RIPE NCC | FI | 1st Jan 1984 |
| 192.175.46.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.175.47.0/24 | 256 | RIPE NCC | FI | 17th Jun 1992 |
| 192.188.105.0/24 | 256 | RIPE NCC |  NO | 26th Jun 1992 |
| 192.188.116.0/24 | 256 | RIPE NCC |  RU | 30th Jun 1992 |
| 192.188.117.0/24 | 256 | RIPE NCC |  GB | 30th Jun 1992 |
| 192.188.122.0/24 | 256 | RIPE NCC |  SE | 1st Jul 1992 |
| 192.188.125.0/24 | 256 | RIPE NCC | GB | 7th Jul 1992 |
| 192.188.127.0/24 | 256 | RIPE NCC |  IE | 7th Jul 1992 |
| 192.188.129.0/24 | 256 | RIPE NCC | GB | 8th Jul 1992 |
| 192.188.132.0/24 | 256 | RIPE NCC | GB | 8th Jul 1992 |
| 192.188.145.0/24 | 256 | RIPE NCC | GB | 13th Jul 1992 |
| 192.188.157.0/24 | 256 | RIPE NCC | GB | 15th Jul 1992 |
| 192.188.158.0/24 | 256 | RIPE NCC | GB | 15th Jul 1992 |
| 192.188.187.0/24 | 256 | RIPE NCC | RU | 21st Jul 1992 |
| 192.188.236.0/23 | 512 | RIPE NCC |  PL | 30th Jul 1992 |
| 192.188.63.0/24 | 256 | RIPE NCC | GB | 23rd Jun 1992 |
| 192.188.64.0/24 | 256 | RIPE NCC | GB | 23rd Jun 1992 |
| 192.188.65.0/24 | 256 | RIPE NCC | FR | 24th Jun 1992 |
| 192.188.69.0/24 | 256 | RIPE NCC | GB | 24th Jun 1992 |
| 192.189.1.0/24 | 256 | RIPE NCC | GB | 15th Jun 1992 |
| 192.189.10.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.189.11.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.189.119.0/24 | 256 | RIPE NCC | GB | 20th Jul 1992 |
| 192.189.154.0/24 | 256 | RIPE NCC |  IT | 27th Jul 1992 |
| 192.189.160.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.166.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.167.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.168.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.169.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.170.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.202.0/24 | 256 | RIPE NCC | GB | 30th Jul 1992 |
| 192.189.203.0/24 | 256 | RIPE NCC | GB | 30th Jul 1992 |
| 192.189.23.0/24 | 256 | RIPE NCC | GB | 18th Jun 1992 |