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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,584 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.144.144.0/22 | 1k | RIPE NCC |  GB | 22nd Aug 2019 |
| 45.144.176.0/22 | 1k | RIPE NCC |  RU | 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 |
| 45.145.156.0/22 | 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 |
| 45.145.32.0/22 | 1k | RIPE NCC | GB | 23rd 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 |
| 45.146.144.0/22 | 1k | RIPE NCC | GB | 28th Aug 2019 |
| 45.146.176.0/22 | 1k | RIPE NCC | GB | 28th Aug 2019 |
| 45.146.20.0/22 | 1k | RIPE NCC | DE | 27th Aug 2019 |
| 45.146.72.0/22 | 1k | RIPE NCC | GB | 28th Aug 2019 |
| 45.146.76.0/22 | 1k | RIPE NCC |  EE | 28th Aug 2019 |
| 45.146.92.0/22 | 1k | RIPE NCC | DE | 28th Aug 2019 |
| 45.146.96.0/22 | 1k | RIPE NCC |  LU | 28th Aug 2019 |
| 45.147.124.0/22 | 1k | RIPE NCC | NL | 30th Aug 2019 |
| 45.147.172.0/22 | 1k | RIPE NCC | DE | 30th Aug 2019 |
| 45.147.240.0/22 | 1k | RIPE NCC | NL | 2nd Sept 2019 |
| 45.147.36.0/22 | 1k | RIPE NCC | DE | 30th Aug 2019 |
| 45.147.52.0/22 | 1k | RIPE NCC |  US | 30th Aug 2019 |
| 45.147.86.0/24 | 256 | RIPE NCC | DE | 30th Aug 2019 |
| 45.147.88.0/22 | 1k | RIPE NCC | GB | 30th Aug 2019 |
| 45.148.128.0/22 | 1k | RIPE NCC | AT | 3rd Sept 2019 |
| 45.148.136.0/22 | 1k | RIPE NCC | DE | 3rd Sept 2019 |
| 45.148.200.0/22 | 1k | RIPE NCC |  OM | 3rd Sept 2019 |
| 45.148.224.0/22 | 1k | RIPE NCC | DE | 3rd Sept 2019 |
| 45.148.36.0/22 | 1k | RIPE NCC |  LT | 2nd Sept 2019 |
| 45.148.48.0/24 | 256 | RIPE NCC | CH | 2nd Sept 2019 |
| 45.148.80.0/22 | 1k | RIPE NCC |  CZ | 2nd Sept 2019 |
| 45.148.92.0/22 | 1k | RIPE NCC |  IQ | 2nd Sept 2019 |
| 45.149.196.0/22 | 1k | RIPE NCC | AT | 5th Sept 2019 |
| 45.149.236.0/22 | 1k | RIPE NCC | CH | 5th Sept 2019 |
| 45.149.48.0/22 | 1k | RIPE NCC |  PL | 4th Sept 2019 |
| 45.149.53.0/24 | 256 | RIPE NCC | DE | 4th Jun 2021 |
| 45.15.152.0/22 | 1k | RIPE NCC |  CY | 13th May 2019 |
| 45.15.160.0/22 | 1k | RIPE NCC | CY | 13th May 2019 |
| 45.15.164.0/22 | 1k | RIPE NCC | CY | 13th May 2019 |