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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,783 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 9.8.0.0/16 | 65.5k | ARIN |  US | 16th Dec 1988 |
| 9.9.0.0/21 | 2k | ARIN | US | 16th Dec 1988 |
| 9.9.10.0/23 | 512 | ARIN | US | 16th Dec 1988 |
| 9.9.12.0/22 | 1k | ARIN | US | 16th Dec 1988 |
| 9.9.128.0/17 | 32.8k | ARIN | US | 16th Dec 1988 |
| 9.9.16.0/20 | 4.1k | ARIN | US | 16th Dec 1988 |
| 9.9.32.0/19 | 8.2k | ARIN | US | 16th Dec 1988 |
| 9.9.64.0/18 | 16.4k | ARIN | US | 16th Dec 1988 |
| 9.9.8.0/24 | 256 | ARIN | US | 16th Dec 1988 |
| 90.156.176.0/20 | 4.1k | RIPE NCC |  RU | 17th Nov 2006 |
| 90.96.0.0/16 | 65.5k | RIPE NCC | US | 2nd Mar 2006 |
| 90.97.128.0/17 | 32.8k | RIPE NCC |  FR | 2nd Mar 2006 |
| 91.102.121.0/24 | 256 | RIPE NCC |  DE | 31st Mar 2026 |
| 91.102.122.0/24 | 256 | RIPE NCC |  EE | 8th Apr 2026 |
| 91.102.123.0/24 | 256 | RIPE NCC |  NL | 13th Apr 2026 |
| 91.102.124.0/24 | 256 | RIPE NCC |  AL | 13th Apr 2026 |
| 91.102.125.0/24 | 256 | RIPE NCC |  ES | 13th Apr 2026 |
| 91.102.16.0/21 | 2k | RIPE NCC |  SA | 10th Oct 2006 |
| 91.102.168.0/21 | 2k | RIPE NCC |  RS | 1st Nov 2006 |
| 91.103.108.0/23 | 512 | RIPE NCC |  LT | 24th Nov 2006 |
| 91.103.136.0/24 | 256 | RIPE NCC |  GB | 12th Jan 2024 |
| 91.103.216.0/21 | 2k | RIPE NCC | DE | 6th Dec 2006 |
| 91.103.88.0/21 | 2k | RIPE NCC |  MT | 24th Nov 2006 |
| 91.105.194.0/23 | 512 | RIPE NCC | RU | 13th Aug 2012 |
| 91.105.208.0/21 | 2k | RIPE NCC |  UA | 13th Aug 2012 |
| 91.105.224.0/21 | 2k | RIPE NCC | GB | 20th Jun 2012 |
| 91.107.104.0/21 | 2k | RIPE NCC | RU | 21st Jun 2012 |
| 91.107.119.0/24 | 256 | RIPE NCC | RU | 21st Jun 2012 |
| 91.108.185.0/24 | 256 | RIPE NCC |  CZ | 12th Jan 2024 |
| 91.108.186.0/24 | 256 | RIPE NCC | LT | 12th Jan 2024 |
| 91.108.191.0/24 | 256 | RIPE NCC | NL | 7th Jan 2025 |
| 91.109.216.0/24 | 256 | APNIC |  AF | 19th Jun 2012 |
| 91.109.217.0/24 | 256 | RIPE NCC | AF | 19th Jun 2012 |
| 91.109.219.0/24 | 256 | RIPE NCC | AF | 19th Jun 2012 |
| 91.109.220.0/22 | 1k | RIPE NCC | AF | 19th Jun 2012 |
| 91.109.96.0/21 | 2k | RIPE NCC | ES | 18th Jun 2012 |
| 91.110.0.0/17 | 32.8k | APNIC |  SG | 8th Aug 2006 |
| 91.123.112.0/20 | 4.1k | RIPE NCC | FR | 6th Mar 2007 |
| 91.123.240.0/20 | 4.1k | RIPE NCC | NL | 14th May 2007 |
| 91.123.58.0/23 | 512 | RIPE NCC |  NO | 13th Dec 2006 |
| 91.132.0.0/22 | 1k | RIPE NCC | DE | 18th Dec 2018 |
| 91.132.101.0/24 | 256 | RIPE NCC | ES | 16th Aug 2023 |
| 91.132.188.0/22 | 1k | RIPE NCC | RU | 20th Dec 2018 |
| 91.132.204.0/22 | 1k | RIPE NCC | CZ | 20th Dec 2018 |
| 91.132.226.0/24 | 256 | RIPE NCC |  SC | 25th Jan 2022 |
| 91.132.232.0/22 | 1k | RIPE NCC | CZ | 21st Dec 2018 |
| 91.132.24.0/22 | 1k | RIPE NCC | ES | 18th Dec 2018 |
| 91.132.248.0/22 | 1k | RIPE NCC |  RO | 21st Dec 2018 |
| 91.132.32.0/22 | 1k | RIPE NCC | GB | 18th Dec 2018 |
| 91.142.131.0/24 | 256 | RIPE NCC | NL | 8th Apr 2010 |