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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,584 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.13.204.0/22 | 1k | RIPE NCC |  CH | 7th May 2019 |
| 45.13.216.0/22 | 1k | RIPE NCC |  DE | 7th May 2019 |
| 45.13.244.0/22 | 1k | RIPE NCC |  AT | 7th May 2019 |
| 45.13.25.0/24 | 256 | RIPE NCC |  RO | 7th Mar 2023 |
| 45.13.26.0/24 | 256 | RIPE NCC |  RS | 7th Mar 2023 |
| 45.130.145.0/24 | 256 | RIPE NCC |  RU | 17th Jul 2019 |
| 45.130.168.0/22 | 1k | RIPE NCC | RU | 18th Jul 2019 |
| 45.130.204.0/22 | 1k | RIPE NCC | AT | 18th Jul 2019 |
| 45.130.212.0/22 | 1k | RIPE NCC | RU | 18th Jul 2019 |
| 45.130.232.0/22 | 1k | RIPE NCC | DE | 18th Jul 2019 |
| 45.130.72.0/22 | 1k | RIPE NCC | AT | 17th Jul 2019 |
| 45.130.96.0/22 | 1k | RIPE NCC |  PS | 17th Jul 2019 |
| 45.131.128.0/22 | 1k | RIPE NCC | RO | 19th Jul 2019 |
| 45.131.140.0/22 | 1k | RIPE NCC |  OM | 19th Jul 2019 |
| 45.131.200.0/22 | 1k | RIPE NCC |  NL | 22nd Jul 2019 |
| 45.131.232.0/22 | 1k | RIPE NCC | DE | 22nd Jul 2019 |
| 45.131.24.0/22 | 1k | RIPE NCC | AT | 18th Jul 2019 |
| 45.132.188.0/22 | 1k | RIPE NCC |  EE | 23rd Jul 2019 |
| 45.132.228.0/22 | 1k | RIPE NCC |  GB | 24th Jul 2019 |
| 45.132.4.0/22 | 1k | RIPE NCC | NL | 22nd Jul 2019 |
| 45.132.52.0/22 | 1k | RIPE NCC | DE | 22nd Jul 2019 |
| 45.132.80.0/22 | 1k | ARIN |  US | 21st Jan 2025 |
| 45.133.144.0/22 | 1k | RIPE NCC |  IT | 25th Jul 2019 |
| 45.133.234.0/24 | 256 | RIPE NCC | RU | 25th Jul 2019 |
| 45.133.240.0/24 | 256 | RIPE NCC | GB | 20th Mar 2023 |
| 45.133.64.0/22 | 1k | RIPE NCC | AT | 24th Jul 2019 |
| 45.133.84.0/22 | 1k | RIPE NCC | AT | 25th Jul 2019 |
| 45.133.96.0/22 | 1k | RIPE NCC | RU | 25th Jul 2019 |
| 45.134.0.0/22 | 1k | RIPE NCC | AT | 26th Jul 2019 |
| 45.134.188.0/22 | 1k | RIPE NCC | DE | 29th Jul 2019 |
| 45.134.242.0/24 | 256 | RIPE NCC | RO | 26th Jan 2026 |
| 45.134.4.0/22 | 1k | RIPE NCC |  CA | 26th Jul 2019 |
| 45.134.98.0/24 | 256 | RIPE NCC |  SG | 10th Feb 2025 |
| 45.135.100.0/22 | 1k | RIPE NCC | AT | 30th Jul 2019 |
| 45.135.112.0/22 | 1k | RIPE NCC |  SA | 30th Jul 2019 |
| 45.135.208.0/24 | 256 | RIPE NCC | NL | 31st Jul 2019 |
| 45.135.209.0/24 | 256 | RIPE NCC |  IS | 31st Jul 2019 |
| 45.135.220.0/22 | 1k | RIPE NCC | AT | 31st Jul 2019 |
| 45.135.76.0/22 | 1k | RIPE NCC | NL | 30th Jul 2019 |
| 45.136.110.0/24 | 256 | RIPE NCC | IT | 31st Mar 2021 |
| 45.136.184.0/22 | 1k | RIPE NCC | DE | 2nd Aug 2019 |
| 45.136.44.0/22 | 1k | RIPE NCC |  BZ | 1st Aug 2019 |
| 45.136.60.0/22 | 1k | RIPE NCC | AT | 1st Aug 2019 |
| 45.136.80.0/22 | 1k | RIPE NCC |  NO | 1st Aug 2019 |
| 45.137.0.0/22 | 1k | RIPE NCC | RO | 2nd Aug 2019 |
| 45.137.120.0/22 | 1k | RIPE NCC |  HU | 5th Aug 2019 |
| 45.137.128.0/22 | 1k | RIPE NCC |  CZ | 5th Aug 2019 |
| 45.137.140.0/22 | 1k | RIPE NCC | DE | 5th Aug 2019 |
| 45.137.168.0/22 | 1k | RIPE NCC | DE | 5th Aug 2019 |
| 45.137.188.0/24 | 256 | RIPE NCC | RU | 6th Aug 2019 |