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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.33.31.0/24 | 256 | RIPE NCC |  GB | 20th Jul 1994 |
| 194.33.33.0/24 | 256 | RIPE NCC | GB | 17th Dec 1993 |
| 194.33.60.0/24 | 256 | RIPE NCC | GB | 5th Jan 1994 |
| 194.34.108.0/22 | 1k | RIPE NCC |  NL | 19th Sept 2018 |
| 194.34.112.0/20 | 4.1k | RIPE NCC | GB | 15th Feb 1994 |
| 194.34.13.0/24 | 256 | RIPE NCC |  FR | 8th Feb 1994 |
| 194.34.136.0/23 | 512 | RIPE NCC |  ES | 21st Oct 2019 |
| 194.34.14.0/23 | 512 | RIPE NCC | GB | 4th Feb 1994 |
| 194.34.140.0/22 | 1k | RIPE NCC |  CH | 15th Feb 1994 |
| 194.34.16.0/20 | 4.1k | RIPE NCC | NL | 12th May 1995 |
| 194.34.164.0/24 | 256 | RIPE NCC |  DE | 24th Jul 2025 |
| 194.34.165.0/24 | 256 | RIPE NCC | NL | 28th Jul 2025 |
| 194.34.192.0/22 | 1k | RIPE NCC | DE | 15th May 2018 |
| 194.34.216.0/22 | 1k | RIPE NCC | GB | 8th Mar 1994 |
| 194.34.220.0/23 | 512 | RIPE NCC | GB | 8th Mar 1994 |
| 194.34.222.0/24 | 256 | RIPE NCC | GB | 8th Mar 1994 |
| 194.34.223.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.34.32.0/22 | 1k | RIPE NCC | NL | 12th May 1995 |
| 194.34.36.0/22 | 1k | RIPE NCC | NL | 8th Feb 1994 |
| 194.34.40.0/21 | 2k | RIPE NCC | NL | 8th Feb 1994 |
| 194.34.48.0/21 | 2k | RIPE NCC | NL | 8th Feb 1994 |
| 194.34.60.0/23 | 512 | RIPE NCC |  FI | 8th Feb 1994 |
| 194.34.62.0/23 | 512 | RIPE NCC | ES | 21st Oct 2019 |
| 194.35.128.0/19 | 8.2k | RIPE NCC | GB | 25th Apr 1994 |
| 194.35.16.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.160.0/20 | 4.1k | RIPE NCC | GB | 4th May 1994 |
| 194.35.17.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.18.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.19.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.22.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.23.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.24.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.242.0/23 | 512 | RIPE NCC | DE | 8th Jun 1994 |
| 194.35.244.0/22 | 1k | RIPE NCC | GB | 8th Jun 1994 |
| 194.35.25.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.26.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.27.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.28.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.29.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.30.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.31.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.60.0/22 | 1k | RIPE NCC |  UA | 30th Oct 2018 |
| 194.35.64.0/21 | 2k | RIPE NCC |  NO | 19th Apr 1994 |
| 194.35.76.0/23 | 512 | RIPE NCC |  IT | 22nd Oct 2019 |
| 194.35.79.0/24 | 256 | RIPE NCC | GB | 4th May 1994 |
| 194.35.82.0/23 | 512 | RIPE NCC |  SE | 4th May 1994 |
| 194.35.94.0/24 | 256 | RIPE NCC | GB | 13th May 1994 |
| 194.36.12.0/22 | 1k | RIPE NCC | GB | 10th Jan 1995 |
| 194.36.172.0/22 | 1k | RIPE NCC |  IR | 16th May 2018 |
| 194.36.189.0/24 | 256 | RIPE NCC | NL | 20th Sept 2018 |