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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.139.64.0/22 | 1k | RIPE NCC |  CZ | 8th Aug 2019 |
| 45.139.80.0/22 | 1k | RIPE NCC |  GB | 8th Aug 2019 |
| 45.14.100.0/22 | 1k | RIPE NCC |  DE | 8th May 2019 |
| 45.14.152.0/22 | 1k | RIPE NCC |  IT | 9th May 2019 |
| 45.14.168.0/22 | 1k | RIPE NCC | GB | 9th May 2019 |
| 45.14.200.0/24 | 256 | RIPE NCC |  FI | 9th May 2019 |
| 45.14.202.0/23 | 512 | RIPE NCC | FI | 9th May 2019 |
| 45.14.44.0/22 | 1k | RIPE NCC |  AT | 7th May 2019 |
| 45.140.104.0/22 | 1k | RIPE NCC |  OM | 13th Aug 2019 |
| 45.140.20.0/22 | 1k | RIPE NCC |  FR | 12th Aug 2019 |
| 45.140.200.0/22 | 1k | RIPE NCC | DE | 13th Aug 2019 |
| 45.140.228.0/22 | 1k | RIPE NCC |  IR | 14th Aug 2019 |
| 45.140.28.0/22 | 1k | RIPE NCC | IR | 12th Aug 2019 |
| 45.140.48.0/22 | 1k | RIPE NCC |  EE | 12th Aug 2019 |
| 45.141.140.0/22 | 1k | RIPE NCC | DE | 15th Aug 2019 |
| 45.141.144.0/22 | 1k | RIPE NCC | AT | 15th Aug 2019 |
| 45.141.218.0/24 | 256 | RIPE NCC |  NO | 14th Jan 2025 |
| 45.141.219.0/24 | 256 | RIPE NCC |  RU | 14th Jan 2025 |
| 45.141.96.0/22 | 1k | RIPE NCC |  CH | 14th Aug 2019 |
| 45.142.12.0/24 | 256 | RIPE NCC | GB | 4th Jun 2021 |
| 45.142.172.0/22 | 1k | RIPE NCC | FR | 19th Aug 2019 |
| 45.142.255.0/24 | 256 | RIPE NCC |  CY | 19th Aug 2019 |
| 45.142.4.0/22 | 1k | RIPE NCC | DE | 16th Aug 2019 |
| 45.142.48.0/22 | 1k | RIPE NCC | CZ | 16th Aug 2019 |
| 45.142.60.0/22 | 1k | RIPE NCC | AT | 16th Aug 2019 |
| 45.143.0.0/22 | 1k | RIPE NCC |  JP | 19th Aug 2019 |
| 45.143.12.0/22 | 1k | RIPE NCC |  VG | 20th Aug 2019 |
| 45.143.158.0/23 | 512 | RIPE NCC | IT | 21st Aug 2019 |
| 45.143.220.0/22 | 1k | RIPE NCC | EE | 21st Aug 2019 |
| 45.144.108.0/22 | 1k | RIPE NCC |  NL | 22nd Aug 2019 |
| 45.144.144.0/22 | 1k | RIPE NCC | GB | 22nd Aug 2019 |
| 45.144.20.0/22 | 1k | RIPE NCC | CH | 22nd Aug 2019 |
| 45.144.231.0/24 | 256 | RIPE NCC |  ES | 23rd Aug 2019 |
| 45.144.44.0/22 | 1k | RIPE NCC | RU | 22nd Aug 2019 |
| 45.144.68.0/22 | 1k | RIPE NCC | AT | 22nd Aug 2019 |
| 45.144.80.0/22 | 1k | RIPE NCC | DE | 22nd Aug 2019 |
| 45.144.96.0/22 | 1k | RIPE NCC | DE | 22nd Aug 2019 |
| 45.145.112.0/22 | 1k | RIPE NCC | FR | 26th Aug 2019 |
| 45.145.156.0/22 | 1k | RIPE NCC | NL | 26th Aug 2019 |
| 45.145.163.0/24 | 256 | RIPE NCC | RU | 26th Aug 2019 |
| 45.145.168.0/24 | 256 | RIPE NCC | RU | 26th Aug 2019 |
| 45.145.192.0/22 | 1k | RIPE NCC | AT | 26th Aug 2019 |
| 45.145.232.0/22 | 1k | RIPE NCC | FR | 27th Aug 2019 |
| 45.145.37.0/24 | 256 | RIPE NCC | DE | 29th Jan 2024 |
| 45.145.5.0/24 | 256 | RIPE NCC | RU | 23rd Aug 2019 |
| 45.145.6.0/24 | 256 | RIPE NCC | RU | 23rd Aug 2019 |
| 45.145.7.0/24 | 256 | RIPE NCC | RU | 23rd Aug 2019 |
| 45.145.76.0/22 | 1k | RIPE NCC |  BZ | 26th Aug 2019 |
| 45.145.80.0/22 | 1k | RIPE NCC | AT | 26th Aug 2019 |
| 45.146.100.0/22 | 1k | RIPE NCC | NL | 28th Aug 2019 |