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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 185.172.248.0/22 | 1k | RIPE NCC |  PL | 13th Oct 2016 |
| 185.172.40.0/22 | 1k | RIPE NCC |  DE | 10th Oct 2016 |
| 185.173.131.0/24 | 256 | RIPE NCC |  IT | 25th Jun 2021 |
| 185.173.140.0/22 | 1k | RIPE NCC |  AT | 18th Oct 2016 |
| 185.173.208.0/22 | 1k | RIPE NCC |  FI | 19th Oct 2016 |
| 185.173.252.0/22 | 1k | RIPE NCC |  FR | 20th Oct 2016 |
| 185.173.44.0/22 | 1k | RIPE NCC |  ES | 8th Apr 2019 |
| 185.174.200.0/22 | 1k | RIPE NCC |  IR | 25th Oct 2016 |
| 185.174.92.0/22 | 1k | RIPE NCC |  CZ | 24th Oct 2016 |
| 185.175.132.0/22 | 1k | RIPE NCC |  SE | 28th Oct 2016 |
| 185.175.172.0/22 | 1k | RIPE NCC |  RU | 31st Oct 2016 |
| 185.175.188.0/22 | 1k | RIPE NCC |  SK | 23rd Feb 2018 |
| 185.175.236.0/22 | 1k | RIPE NCC |  UA | 1st Nov 2016 |
| 185.175.64.0/24 | 256 | RIPE NCC | DE | 10th Dec 2025 |
| 185.175.66.0/24 | 256 | RIPE NCC |  GB | 11th Dec 2025 |
| 185.175.67.0/24 | 256 | RIPE NCC |  TR | 11th Dec 2025 |
| 185.175.68.0/22 | 1k | RIPE NCC |  US | 27th Oct 2016 |
| 185.175.96.0/22 | 1k | RIPE NCC |  NO | 28th Oct 2016 |
| 185.176.133.0/24 | 256 | RIPE NCC | FR | 12th Jan 2024 |
| 185.176.135.0/24 | 256 | RIPE NCC | DE | 12th Jan 2024 |
| 185.176.192.0/22 | 1k | RIPE NCC | DE | 5th Aug 2019 |
| 185.176.52.0/22 | 1k | ARIN | US | 19th Feb 2019 |
| 185.176.60.0/22 | 1k | RIPE NCC |  LV | 3rd Nov 2016 |
| 185.177.108.0/22 | 1k | RIPE NCC | RU | 11th Nov 2016 |
| 185.177.160.0/22 | 1k | RIPE NCC |  DK | 14th Nov 2016 |
| 185.177.208.0/24 | 256 | RIPE NCC | FI | 31st Dec 2019 |
| 185.177.210.0/24 | 256 | RIPE NCC |  NL | 2nd Jan 2020 |
| 185.177.252.0/22 | 1k | RIPE NCC | DK | 16th Nov 2016 |
| 185.177.36.0/22 | 1k | RIPE NCC | IT | 10th Nov 2016 |
| 185.178.100.0/22 | 1k | RIPE NCC | GB | 18th Nov 2016 |
| 185.178.112.0/22 | 1k | RIPE NCC | DK | 18th Nov 2016 |
| 185.178.116.0/22 | 1k | RIPE NCC | DE | 18th Nov 2016 |
| 185.178.124.0/22 | 1k | RIPE NCC | SE | 21st Nov 2016 |
| 185.178.128.0/22 | 1k | RIPE NCC | RU | 21st Nov 2016 |
| 185.178.168.0/24 | 256 | RIPE NCC | ES | 22nd Nov 2016 |
| 185.178.170.0/24 | 256 | RIPE NCC | ES | 22nd Nov 2016 |
| 185.178.188.0/22 | 1k | RIPE NCC | GB | 22nd Nov 2016 |
| 185.178.230.0/24 | 256 | RIPE NCC | GB | 23rd Nov 2016 |
| 185.178.36.0/22 | 1k | RIPE NCC | GB | 17th Nov 2016 |
| 185.178.52.0/22 | 1k | RIPE NCC | US | 18th Nov 2016 |
| 185.179.101.0/24 | 256 | RIPE NCC |  JE | 10th Aug 2020 |
| 185.179.108.0/22 | 1k | RIPE NCC |  IS | 25th Nov 2016 |
| 185.179.125.0/24 | 256 | RIPE NCC | DE | 22nd Jan 2026 |
| 185.179.126.0/24 | 256 | RIPE NCC | TR | 22nd Jan 2026 |
| 185.179.127.0/24 | 256 | RIPE NCC | DE | 22nd Jan 2026 |
| 185.179.160.0/22 | 1k | RIPE NCC | RU | 29th Nov 2016 |
| 185.179.204.0/22 | 1k | RIPE NCC | US | 30th Nov 2016 |
| 185.179.240.0/22 | 1k | RIPE NCC |  IL | 30th Nov 2016 |
| 185.179.244.0/24 | 256 | RIPE NCC | ES | 14th Aug 2020 |
| 185.179.4.0/22 | 1k | RIPE NCC | RU | 24th Nov 2016 |