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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,108 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 185.34.116.0/22 | 1k | RIPE NCC |  GB | 2nd Sept 2013 |
| 185.34.64.0/23 | 512 | RIPE NCC |  RO | 29th Aug 2013 |
| 185.35.0.0/22 | 1k | RIPE NCC |  RU | 11th Sept 2013 |
| 185.35.104.0/22 | 1k | RIPE NCC |  AE | 16th Sept 2013 |
| 185.35.24.0/22 | 1k | RIPE NCC | GB | 12th Sept 2013 |
| 185.35.44.0/22 | 1k | RIPE NCC | RU | 13th Sept 2013 |
| 185.36.100.0/24 | 256 | RIPE NCC | RU | 10th Jan 2024 |
| 185.36.101.0/24 | 256 | RIPE NCC |  PT | 10th Jan 2024 |
| 185.36.108.0/22 | 1k | RIPE NCC | GB | 30th Sept 2013 |
| 185.36.12.0/22 | 1k | RIPE NCC |  FR | 24th Sept 2013 |
| 185.36.152.0/22 | 1k | RIPE NCC |  PL | 1st Oct 2013 |
| 185.36.196.0/22 | 1k | RIPE NCC |  UA | 2nd Oct 2013 |
| 185.36.20.0/24 | 256 | RIPE NCC |  AT | 16th Jun 2026 |
| 185.36.21.0/24 | 256 | RIPE NCC |  IT | 16th Jun 2026 |
| 185.36.23.0/24 | 256 | RIPE NCC | RU | 16th Jun 2026 |
| 185.36.64.0/22 | 1k | RIPE NCC | FR | 26th Sept 2013 |
| 185.36.8.0/22 | 1k | RIPE NCC | GB | 24th Sept 2013 |
| 185.37.10.0/24 | 256 | RIPE NCC | UA | 7th Mar 2023 |
| 185.37.140.0/22 | 1k | RIPE NCC |  SE | 14th Oct 2013 |
| 185.37.172.0/22 | 1k | RIPE NCC | GB | 14th Oct 2013 |
| 185.37.236.0/24 | 256 | RIPE NCC |  KZ | 16th Jan 2025 |
| 185.37.237.0/24 | 256 | RIPE NCC |  DK | 16th Jan 2025 |
| 185.37.244.0/22 | 1k | RIPE NCC |  NL | 16th Oct 2013 |
| 185.38.136.0/22 | 1k | RIPE NCC | IT | 23rd Oct 2013 |
| 185.38.172.0/24 | 256 | RIPE NCC |  DE | 23rd Jan 2026 |
| 185.38.180.0/22 | 1k | RIPE NCC | DK | 24th Oct 2013 |
| 185.38.188.0/22 | 1k | RIPE NCC |  CZ | 24th Oct 2013 |
| 185.38.196.0/22 | 1k | RIPE NCC | FR | 24th Oct 2013 |
| 185.38.220.0/24 | 256 | RIPE NCC | PL | 25th Oct 2013 |
| 185.38.222.0/23 | 512 | RIPE NCC | PL | 25th Oct 2013 |
| 185.38.96.0/22 | 1k | RIPE NCC | SE | 22nd Oct 2013 |
| 185.39.11.0/24 | 256 | RIPE NCC | AT | 8th Dec 2021 |
| 185.39.128.0/22 | 1k | RIPE NCC |  FI | 31st Oct 2013 |
| 185.39.132.0/22 | 1k | RIPE NCC | RU | 31st Oct 2013 |
| 185.39.156.0/22 | 1k | RIPE NCC | FR | 4th Nov 2013 |
| 185.39.236.0/22 | 1k | RIPE NCC |  ZA | 7th Nov 2013 |
| 185.39.52.0/22 | 1k | ARIN |  US | 22nd Jun 2020 |
| 185.39.96.0/22 | 1k | RIPE NCC |  ES | 31st Oct 2013 |
| 185.4.136.0/22 | 1k | RIPE NCC | DK | 26th Sept 2012 |
| 185.4.192.0/22 | 1k | RIPE NCC |  IE | 27th Sept 2012 |
| 185.4.224.0/23 | 512 | RIPE NCC |  GE | 27th Sept 2012 |
| 185.4.24.0/22 | 1k | RIPE NCC | GB | 25th Sept 2012 |
| 185.4.56.0/22 | 1k | RIPE NCC | RU | 25th Sept 2012 |
| 185.40.164.0/22 | 1k | RIPE NCC |  BG | 15th Nov 2013 |
| 185.40.220.0/22 | 1k | RIPE NCC | IT | 19th Nov 2013 |
| 185.40.24.0/22 | 1k | RIPE NCC | US | 11th Nov 2013 |
| 185.41.164.0/22 | 1k | RIPE NCC | IT | 27th Nov 2013 |
| 185.41.172.0/22 | 1k | RIPE NCC | SE | 27th Nov 2013 |
| 185.41.220.0/22 | 1k | RIPE NCC |  IR | 4th Feb 2019 |
| 185.41.44.0/22 | 1k | RIPE NCC | GB | 29th Nov 2013 |