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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 46.174.135.0/24 | 256 | RIPE NCC |  NL | 29th Dec 2010 |
| 46.174.216.0/21 | 2k | RIPE NCC |  GE | 21st Jan 2011 |
| 46.174.232.0/22 | 1k | RIPE NCC |  PL | 25th Jan 2011 |
| 46.174.236.0/23 | 512 | RIPE NCC | PL | 25th Jan 2011 |
| 46.174.238.0/24 | 256 | RIPE NCC | PL | 25th Jan 2011 |
| 46.175.132.0/24 | 256 | RIPE NCC |  HK | 5th Aug 2021 |
| 46.175.152.0/22 | 1k | RIPE NCC |  RO | 15th Jun 2018 |
| 46.18.184.0/21 | 2k | RIPE NCC |  DE | 2nd Nov 2010 |
| 46.182.152.0/21 | 2k | RIPE NCC |  IT | 25th Nov 2010 |
| 46.182.240.0/21 | 2k | RIPE NCC | DE | 30th Nov 2010 |
| 46.183.152.0/21 | 2k | RIPE NCC | DE | 9th Dec 2010 |
| 46.183.19.0/24 | 256 | RIPE NCC | NL | 21st Jan 2026 |
| 46.183.23.0/24 | 256 | RIPE NCC |  IQ | 22nd Jan 2026 |
| 46.183.240.0/21 | 2k | RIPE NCC | NL | 14th Dec 2010 |
| 46.183.80.0/21 | 2k | RIPE NCC |  RU | 6th Dec 2010 |
| 46.183.88.0/21 | 2k | RIPE NCC |  US | 7th Dec 2010 |
| 46.19.240.0/21 | 2k | RIPE NCC |  GB | 18th Nov 2010 |
| 46.19.7.0/24 | 256 | RIPE NCC |  BE | 4th Nov 2010 |
| 46.191.0.0/17 | 32.8k | RIPE NCC |  BY | 14th Dec 2010 |
| 46.21.20.0/24 | 256 | RIPE NCC |  CH | 25th Oct 2010 |
| 46.22.64.0/20 | 4.1k | RIPE NCC | US | 23rd Nov 2010 |
| 46.226.152.0/21 | 2k | RIPE NCC |  SE | 24th Jan 2011 |
| 46.226.248.0/21 | 2k | RIPE NCC | GB | 26th Jan 2011 |
| 46.226.48.0/21 | 2k | RIPE NCC | GB | 20th Jan 2011 |
| 46.227.72.0/21 | 2k | RIPE NCC | SE | 28th Jan 2011 |
| 46.227.8.0/21 | 2k | RIPE NCC |  CZ | 26th Jan 2011 |
| 46.228.144.0/20 | 4.1k | RIPE NCC | US | 7th Feb 2011 |
| 46.228.224.0/20 | 4.1k | RIPE NCC | PL | 9th Feb 2011 |
| 46.228.64.0/20 | 4.1k | RIPE NCC | RU | 4th Feb 2011 |
| 46.23.16.0/20 | 4.1k | RIPE NCC | DE | 1st Dec 2010 |
| 46.23.216.0/21 | 2k | ARIN | US | 3rd Jun 2024 |
| 46.230.160.0/21 | 2k | RIPE NCC |  NO | 8th Feb 2011 |
| 46.230.176.0/20 | 4.1k | RIPE NCC | SE | 8th Feb 2011 |
| 46.230.192.0/18 | 16.4k | RIPE NCC | SE | 8th Feb 2011 |
| 46.231.104.0/21 | 2k | RIPE NCC | NL | 7th Feb 2011 |
| 46.231.128.0/21 | 2k | RIPE NCC |  FR | 7th Feb 2011 |
| 46.231.136.0/21 | 2k | RIPE NCC | DE | 7th Feb 2011 |
| 46.235.5.0/24 | 256 | RIPE NCC | GB | 8th Feb 2011 |
| 46.237.128.0/18 | 16.4k | RIPE NCC | GB | 26th Jan 2011 |
| 46.243.212.0/24 | 256 | RIPE NCC | RU | 28th Dec 2010 |
| 46.243.218.0/23 | 512 | RIPE NCC | RU | 28th Dec 2010 |
| 46.243.255.0/24 | 256 | RIPE NCC | NL | 28th Dec 2010 |
| 46.243.56.0/22 | 1k | RIPE NCC | FR | 15th Jun 2018 |
| 46.245.235.0/24 | 256 | RIPE NCC | IT | 19th Aug 2024 |
| 46.245.236.0/24 | 256 | RIPE NCC |  HR | 19th Aug 2024 |
| 46.247.104.0/22 | 1k | ARIN | US | 3rd Feb 2025 |
| 46.247.44.0/22 | 1k | RIPE NCC | GB | 1st Feb 2011 |
| 46.247.48.0/21 | 2k | RIPE NCC | GB | 1st Feb 2011 |
| 46.247.56.0/23 | 512 | RIPE NCC | GB | 1st Feb 2011 |
| 46.247.62.0/23 | 512 | RIPE NCC | GB | 1st Feb 2011 |