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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,075 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 185.100.124.0/22 | 1k | RIPE NCC |  IT | 15th May 2015 |
| 185.100.152.0/22 | 1k | RIPE NCC |  SA | 18th May 2015 |
| 185.100.40.0/22 | 1k | APNIC |  BN | 13th May 2015 |
| 185.101.100.0/22 | 1k | RIPE NCC |  DE | 21st May 2015 |
| 185.101.164.0/22 | 1k | RIPE NCC |  ES | 26th May 2015 |
| 185.101.168.0/22 | 1k | RIPE NCC |  RO | 26th May 2015 |
| 185.101.192.0/22 | 1k | RIPE NCC |  GB | 26th May 2015 |
| 185.101.232.0/22 | 1k | RIPE NCC |  PL | 27th May 2015 |
| 185.101.244.0/22 | 1k | RIPE NCC |  NL | 27th May 2015 |
| 185.102.104.0/22 | 1k | RIPE NCC | DE | 28th May 2015 |
| 185.102.140.0/22 | 1k | RIPE NCC | IT | 29th May 2015 |
| 185.102.192.0/22 | 1k | RIPE NCC | GB | 1st Jun 2015 |
| 185.102.196.0/22 | 1k | RIPE NCC | GB | 1st Jun 2015 |
| 185.102.200.0/22 | 1k | RIPE NCC | GB | 1st Jun 2015 |
| 185.102.244.0/22 | 1k | RIPE NCC | GB | 3rd Jun 2015 |
| 185.102.252.0/22 | 1k | RIPE NCC | DE | 3rd Jun 2015 |
| 185.102.4.0/22 | 1k | RIPE NCC | NL | 27th May 2015 |
| 185.102.52.0/22 | 1k | RIPE NCC |  NO | 27th May 2015 |
| 185.103.0.0/22 | 1k | RIPE NCC |  LU | 3rd Jun 2015 |
| 185.103.203.0/24 | 256 | RIPE NCC |  EE | 28th May 2025 |
| 185.103.220.0/22 | 1k | RIPE NCC | GB | 10th Jun 2015 |
| 185.103.4.0/22 | 1k | RIPE NCC | GB | 3rd Jun 2015 |
| 185.103.92.0/22 | 1k | RIPE NCC | DE | 5th Jun 2015 |
| 185.104.0.0/24 | 256 | RIPE NCC |  FR | 23rd Jan 2026 |
| 185.104.2.0/24 | 256 | RIPE NCC |  CA | 23rd Jan 2026 |
| 185.104.216.0/22 | 1k | RIPE NCC | DE | 16th Jun 2015 |
| 185.104.24.0/22 | 1k | RIPE NCC | IT | 11th Jun 2015 |
| 185.104.3.0/24 | 256 | RIPE NCC |  OM | 23rd Jan 2026 |
| 185.104.48.0/22 | 1k | RIPE NCC | RO | 11th Jun 2015 |
| 185.104.52.0/22 | 1k | RIPE NCC | RO | 11th Jun 2015 |
| 185.104.60.0/23 | 512 | RIPE NCC |  CH | 11th Jun 2015 |
| 185.104.64.0/22 | 1k | RIPE NCC | PL | 11th Jun 2015 |
| 185.104.80.0/22 | 1k | RIPE NCC | GB | 12th Jun 2015 |
| 185.105.124.0/22 | 1k | RIPE NCC | GB | 19th Jun 2015 |
| 185.105.164.0/22 | 1k | RIPE NCC |  IE | 22nd Jun 2015 |
| 185.105.76.0/22 | 1k | RIPE NCC | NL | 19th Jun 2015 |
| 185.105.8.0/24 | 256 | RIPE NCC |  PT | 5th Feb 2021 |
| 185.105.9.0/24 | 256 | RIPE NCC | NO | 5th Aug 2026 |
| 185.106.118.0/24 | 256 | RIPE NCC | FR | 26th Jan 2026 |
| 185.106.121.0/24 | 256 | RIPE NCC | NL | 26th Jun 2015 |
| 185.106.40.0/22 | 1k | RIPE NCC |  RU | 25th Jun 2015 |
| 185.106.64.0/22 | 1k | RIPE NCC | CH | 25th Jun 2015 |
| 185.107.180.0/22 | 1k | RIPE NCC | GB | 22nd Feb 2018 |
| 185.107.20.0/22 | 1k | RIPE NCC |  RS | 2nd Jul 2015 |
| 185.107.208.0/22 | 1k | RIPE NCC |  BE | 6th Jul 2015 |
| 185.107.238.0/24 | 256 | RIPE NCC |  HU | 10th Feb 2020 |
| 185.107.76.0/22 | 1k | RIPE NCC |  QA | 3rd Jul 2015 |
| 185.108.124.0/24 | 256 | RIPE NCC |  TR | 20th Feb 2020 |
| 185.108.144.0/22 | 1k | RIPE NCC |  MD | 10th Jul 2015 |
| 185.108.152.0/22 | 1k | RIPE NCC | MD | 10th Jul 2015 |