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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 107.161.33.0/24 | 256 | ARIN |  CA | 9th Jan 2014 |
| 107.161.48.0/24 | 256 | ARIN |  US | 13th Jan 2014 |
| 107.161.49.0/24 | 256 | ARIN | US | 6th Oct 2022 |
| 107.164.0.0/15 | 131k | ARIN | US | 21st Jun 2024 |
| 107.167.240.0/24 | 256 | ARIN | US | 23rd Dec 2024 |
| 107.167.244.0/22 | 1k | ARIN | US | 4th Feb 2014 |
| 107.176.0.0/15 | 131k | ARIN | US | 9th Mar 2020 |
| 107.182.137.0/24 | 256 | ARIN | US | 7th Apr 2021 |
| 107.182.48.0/20 | 4.1k | ARIN | US | 7th Feb 2014 |
| 107.184.0.0/15 | 131k | ARIN | US | 12th Feb 2014 |
| 107.190.160.0/20 | 4.1k | ARIN | US | 17th Apr 2014 |
| 107.191.240.0/20 | 4.1k | ARIN | US | 31st Dec 2018 |
| 107.191.64.0/23 | 512 | ARIN | US | 30th Apr 2019 |
| 107.191.68.0/24 | 256 | RIPE NCC |  IE | 14th May 2014 |
| 107.191.69.0/24 | 256 | ARIN | US | 8th Apr 2019 |
| 107.191.70.0/23 | 512 | ARIN | US | 25th Mar 2019 |
| 107.191.75.0/24 | 256 | ARIN | US | 28th Mar 2018 |
| 107.6.64.0/21 | 2k | ARIN | US | 23rd Jul 2026 |
| 108.160.212.0/22 | 1k | ARIN | US | 5th Jan 2022 |
| 108.160.220.0/22 | 1k | ARIN | US | 13th Jan 2026 |
| 108.161.16.0/20 | 4.1k | ARIN | US | 19th Oct 2011 |
| 108.161.240.0/20 | 4.1k | ARIN | US | 11th Nov 2011 |
| 108.171.224.0/20 | 4.1k | ARIN | US | 5th Mar 2012 |
| 108.174.88.0/22 | 1k | ARIN | US | 18th Jun 2018 |
| 108.174.92.0/22 | 1k | ARIN | US | 25th Jul 2018 |
| 108.175.128.0/20 | 4.1k | ARIN | CA | 27th Feb 2012 |
| 108.182.0.0/15 | 131k | ARIN | US | 30th Aug 2012 |
| 108.184.0.0/15 | 131k | ARIN | US | 24th Jan 2013 |
| 108.60.16.0/20 | 4.1k | RIPE NCC |  GB | 29th Nov 2010 |
| 109.104.104.0/24 | 256 | RIPE NCC |  TR | 4th Sept 2009 |
| 109.104.157.0/24 | 256 | RIPE NCC |  IN | 4th Sept 2009 |
| 109.104.64.0/19 | 8.2k | RIPE NCC |  DE | 27th Aug 2009 |
| 109.104.99.0/24 | 256 | RIPE NCC | DE | 4th Sept 2009 |
| 109.106.20.0/22 | 1k | RIPE NCC |  RU | 12th Oct 2018 |
| 109.106.64.0/19 | 8.2k | RIPE NCC |  FR | 22nd Sept 2009 |
| 109.106.8.0/22 | 1k | RIPE NCC |  FI | 12th Oct 2018 |
| 109.107.128.0/24 | 256 | RIPE NCC |  EE | 21st Oct 2021 |
| 109.107.133.0/24 | 256 | RIPE NCC |  CH | 21st Oct 2021 |
| 109.107.134.0/24 | 256 | RIPE NCC | TR | 21st Oct 2021 |
| 109.107.146.0/24 | 256 | RIPE NCC | RU | 21st Oct 2021 |
| 109.107.153.0/24 | 256 | RIPE NCC |  NL | 21st Oct 2021 |
| 109.107.156.0/24 | 256 | RIPE NCC | DE | 21st Oct 2021 |
| 109.107.158.0/24 | 256 | RIPE NCC |  CZ | 22nd Oct 2021 |
| 109.120.143.0/24 | 256 | RIPE NCC |  SG | 27th Aug 2009 |
| 109.120.64.0/18 | 16.4k | RIPE NCC |  LU | 27th Aug 2009 |
| 109.121.116.0/22 | 1k | RIPE NCC |  RS | 23rd Sept 2009 |
| 109.121.120.0/22 | 1k | RIPE NCC | RS | 23rd Sept 2009 |
| 109.121.124.0/23 | 512 | RIPE NCC | RS | 23rd Sept 2009 |
| 109.121.126.0/24 | 256 | RIPE NCC | RS | 23rd Sept 2009 |
| 109.122.32.0/21 | 2k | RIPE NCC | FR | 25th Sept 2009 |