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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 212.40.174.0/23 | 512 | RIPE NCC |  DE | 19th Mar 1999 |
| 212.40.177.0/24 | 256 | RIPE NCC | DE | 19th Mar 1999 |
| 212.40.178.0/23 | 512 | RIPE NCC | DE | 19th Mar 1999 |
| 212.40.180.0/24 | 256 | RIPE NCC | DE | 19th Mar 1999 |
| 212.40.184.0/23 | 512 | RIPE NCC | DE | 19th Mar 1999 |
| 212.40.187.0/24 | 256 | RIPE NCC | DE | 19th Mar 1999 |
| 212.40.188.0/22 | 1k | RIPE NCC | DE | 19th Mar 1999 |
| 212.43.160.0/19 | 8.2k | RIPE NCC |  GB | 15th Apr 1999 |
| 212.46.134.0/23 | 512 | RIPE NCC | GB | 12th May 1998 |
| 212.46.136.0/23 | 512 | RIPE NCC | GB | 12th May 1998 |
| 212.46.146.0/23 | 512 | RIPE NCC | GB | 12th May 1998 |
| 212.46.150.0/23 | 512 | RIPE NCC | GB | 12th May 1998 |
| 212.46.152.0/22 | 1k | RIPE NCC | GB | 12th May 1998 |
| 212.46.156.0/23 | 512 | RIPE NCC | GB | 12th May 1998 |
| 212.46.160.0/21 | 2k | RIPE NCC |  IT | 21st Dec 2007 |
| 212.46.48.0/24 | 256 | RIPE NCC |  UA | 28th Feb 2022 |
| 212.47.32.0/24 | 256 | RIPE NCC |  RU | 20th Jan 2026 |
| 212.47.34.0/24 | 256 | RIPE NCC | GB | 20th Jan 2026 |
| 212.47.37.0/24 | 256 | RIPE NCC |  TR | 20th Jan 2026 |
| 212.47.38.0/24 | 256 | RIPE NCC | DE | 20th Jan 2026 |
| 212.47.41.0/24 | 256 | RIPE NCC | TR | 20th Jan 2026 |
| 212.47.45.0/24 | 256 | RIPE NCC |  BA | 20th Jan 2026 |
| 212.47.46.0/24 | 256 | RIPE NCC | TR | 20th Jan 2026 |
| 212.47.48.0/24 | 256 | RIPE NCC |  NL | 16th Feb 2026 |
| 212.47.49.0/24 | 256 | RIPE NCC |  SE | 17th Feb 2026 |
| 212.47.51.0/24 | 256 | RIPE NCC | TR | 18th Feb 2026 |
| 212.47.52.0/24 | 256 | RIPE NCC | GB | 16th Mar 2026 |
| 212.47.53.0/24 | 256 | RIPE NCC |  CH | 16th Mar 2026 |
| 212.47.57.0/24 | 256 | RIPE NCC |  IM | 22nd Jun 2026 |
| 212.47.60.0/24 | 256 | RIPE NCC |  RO | 22nd Jun 2026 |
| 212.47.61.0/24 | 256 | RIPE NCC |  IQ | 22nd Jun 2026 |
| 212.47.62.0/24 | 256 | RIPE NCC |  US | 23rd Jun 2026 |
| 212.47.63.0/24 | 256 | RIPE NCC | DE | 23rd Jun 2026 |
| 212.47.88.0/21 | 2k | RIPE NCC |  BG | 29th Jul 1998 |
| 212.48.160.0/22 | 1k | RIPE NCC | IT | 18th Mar 1999 |
| 212.49.32.0/19 | 8.2k | RIPE NCC |  PL | 14th Jan 2009 |
| 212.5.40.0/21 | 2k | RIPE NCC | BG | 2nd Sept 2008 |
| 212.5.52.0/23 | 512 | RIPE NCC | BG | 2nd Sept 2008 |
| 212.5.54.0/24 | 256 | RIPE NCC | BG | 2nd Sept 2008 |
| 212.52.1.0/24 | 256 | RIPE NCC |  LV | 5th Nov 2021 |
| 212.52.14.0/24 | 256 | RIPE NCC |  GE | 5th Nov 2021 |
| 212.52.19.0/24 | 256 | RIPE NCC | PL | 5th Nov 2021 |
| 212.52.22.0/24 | 256 | RIPE NCC |  NO | 8th Nov 2021 |
| 212.52.3.0/24 | 256 | RIPE NCC |  AT | 5th Nov 2021 |
| 212.52.6.0/24 | 256 | RIPE NCC | GB | 5th Nov 2021 |
| 212.53.16.0/20 | 4.1k | RIPE NCC | NL | 3rd Apr 1998 |
| 212.53.96.0/19 | 8.2k | RIPE NCC | SE | 13th Sept 1999 |
| 212.6.33.0/24 | 256 | RIPE NCC |  IR | 19th Aug 2026 |
| 212.6.37.0/24 | 256 | RIPE NCC |  KW | 22nd Jan 2020 |
| 212.6.42.0/24 | 256 | RIPE NCC | US | 17th Jan 2025 |