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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 45.153.168.0/22 | 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 |
| 45.154.184.0/22 | 1k | RIPE NCC | RU | 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 |
| 45.155.6.0/24 | 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 |
| 45.156.21.0/24 | 256 | RIPE NCC | RU | 19th Sept 2019 |
| 45.156.22.0/23 | 512 | RIPE NCC | RU | 19th Sept 2019 |
| 45.156.232.0/22 | 1k | RIPE NCC | FR | 24th Sept 2019 |
| 45.156.24.0/22 | 1k | RIPE NCC | RU | 19th Sept 2019 |
| 45.156.68.0/22 | 1k | RIPE NCC | ES | 20th Sept 2019 |
| 45.156.80.0/22 | 1k | RIPE NCC | GB | 20th Sept 2019 |
| 45.157.108.0/22 | 1k | RIPE NCC | NL | 25th Sept 2019 |
| 45.157.172.0/23 | 512 | RIPE NCC | DE | 26th Sept 2019 |
| 45.157.192.0/22 | 1k | RIPE NCC |  EE | 26th Sept 2019 |
| 45.157.20.0/22 | 1k | RIPE NCC | ES | 24th Sept 2019 |
| 45.157.24.0/22 | 1k | RIPE NCC | NL | 24th Sept 2019 |
| 45.157.252.0/22 | 1k | RIPE NCC | GB | 26th Sept 2019 |
| 45.157.28.0/22 | 1k | RIPE NCC | DE | 24th Sept 2019 |
| 45.157.68.0/22 | 1k | RIPE NCC |  HK | 25th Sept 2019 |
| 45.157.88.0/22 | 1k | APNIC |  TH | 25th Sept 2019 |
| 45.157.92.0/22 | 1k | RIPE NCC | HK | 25th Sept 2019 |
| 45.158.132.0/22 | 1k | RIPE NCC | DE | 27th Sept 2019 |
| 45.158.156.0/22 | 1k | RIPE NCC |  PS | 27th Sept 2019 |