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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.15.168.0/22 | 1k | RIPE NCC |  CY | 13th May 2019 |
| 45.15.184.0/22 | 1k | RIPE NCC | CY | 13th May 2019 |
| 45.15.36.0/22 | 1k | RIPE NCC |  AT | 10th May 2019 |
| 45.15.68.0/22 | 1k | RIPE NCC |  HU | 10th May 2019 |
| 45.150.100.0/22 | 1k | RIPE NCC |  DE | 6th Sept 2019 |
| 45.150.132.0/22 | 1k | RIPE NCC |  NL | 6th Sept 2019 |
| 45.151.112.0/22 | 1k | RIPE NCC | NL | 10th Sept 2019 |
| 45.151.188.0/22 | 1k | RIPE NCC |  FR | 10th Sept 2019 |
| 45.151.20.0/22 | 1k | RIPE NCC | DE | 9th Sept 2019 |
| 45.151.200.0/22 | 1k | RIPE NCC | NL | 10th Sept 2019 |
| 45.151.204.0/22 | 1k | RIPE NCC | AT | 10th Sept 2019 |
| 45.151.214.0/24 | 256 | RIPE NCC |  IS | 10th Sept 2019 |
| 45.151.228.0/22 | 1k | RIPE NCC |  RU | 10th Sept 2019 |
| 45.151.24.0/22 | 1k | RIPE NCC |  BZ | 9th Sept 2019 |
| 45.151.32.0/22 | 1k | RIPE NCC | NL | 9th Sept 2019 |
| 45.151.36.0/22 | 1k | RIPE NCC | NL | 9th Sept 2019 |
| 45.151.89.0/24 | 256 | RIPE NCC |  BG | 9th Sept 2019 |
| 45.152.244.0/22 | 1k | RIPE NCC | DE | 12th Sept 2019 |
| 45.152.40.0/22 | 1k | RIPE NCC | AT | 11th Sept 2019 |
| 45.152.84.0/24 | 256 | RIPE NCC | RU | 11th Sept 2019 |
| 45.152.85.0/24 | 256 | RIPE NCC | RU | 11th Sept 2019 |
| 45.152.86.0/24 | 256 | RIPE NCC | RU | 11th Sept 2019 |
| 45.152.87.0/24 | 256 | RIPE NCC | RU | 11th Sept 2019 |
| 45.153.144.0/22 | 1k | RIPE NCC | DE | 13th Sept 2019 |
| 45.153.160.0/22 | 1k | RIPE NCC |  CZ | 13th Sept 2019 |
| 45.153.168.0/22 | 1k | RIPE NCC | AT | 13th Sept 2019 |
| 45.153.174.0/24 | 256 | RIPE NCC |  UA | 29th Jan 2026 |
| 45.153.175.0/24 | 256 | RIPE NCC |  IQ | 30th Jan 2026 |
| 45.154.0.0/24 | 256 | RIPE NCC | RU | 16th Sept 2019 |
| 45.154.1.0/24 | 256 | RIPE NCC | RU | 16th Sept 2019 |
| 45.154.124.0/22 | 1k | RIPE NCC |  US | 16th Sept 2019 |
| 45.154.128.0/22 | 1k | RIPE NCC | UA | 16th Sept 2019 |
| 45.154.168.0/22 | 1k | RIPE NCC | FR | 17th Sept 2019 |
| 45.154.188.0/22 | 1k | RIPE NCC | NL | 17th Sept 2019 |
| 45.154.2.0/23 | 512 | RIPE NCC | RU | 16th Sept 2019 |
| 45.154.200.0/22 | 1k | RIPE NCC |  CH | 17th Sept 2019 |
| 45.154.219.0/24 | 256 | ARIN | US | 11th Apr 2022 |
| 45.154.40.0/22 | 1k | RIPE NCC |  GB | 16th Sept 2019 |
| 45.155.152.0/22 | 1k | RIPE NCC |  SE | 18th Sept 2019 |
| 45.155.180.0/22 | 1k | RIPE NCC | GB | 19th Sept 2019 |
| 45.155.188.0/22 | 1k | RIPE NCC | GB | 19th Sept 2019 |
| 45.155.216.0/22 | 1k | RIPE NCC | NL | 19th Sept 2019 |
| 45.155.232.0/22 | 1k | RIPE NCC | GB | 19th Sept 2019 |
| 45.155.28.0/22 | 1k | RIPE NCC |  IE | 17th Sept 2019 |
| 45.155.32.0/22 | 1k | RIPE NCC |  ES | 17th Sept 2019 |
| 45.155.40.0/22 | 1k | RIPE NCC | DE | 18th Sept 2019 |
| 45.155.6.0/24 | 256 | RIPE NCC | RU | 17th Sept 2019 |
| 45.155.8.0/22 | 1k | RIPE NCC |  IT | 17th Sept 2019 |
| 45.156.172.0/22 | 1k | RIPE NCC | NL | 23rd Sept 2019 |
| 45.156.20.0/24 | 256 | RIPE NCC | RU | 19th Sept 2019 |