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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,619 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 62.75.226.0/23 | 512 | RIPE NCC |  DE | 27th Jul 2001 |
| 62.75.240.0/21 | 2k | RIPE NCC | DE | 27th Jul 2001 |
| 62.75.248.0/22 | 1k | RIPE NCC | DE | 27th Jul 2001 |
| 62.76.148.0/23 | 512 | RIPE NCC |  RU | 16th Jun 1997 |
| 62.76.150.0/24 | 256 | RIPE NCC | RU | 16th Jun 1997 |
| 62.76.151.0/24 | 256 | RIPE NCC | RU | 16th Jun 1997 |
| 62.76.240.0/22 | 1k | RIPE NCC | RU | 16th Jun 1997 |
| 62.76.244.0/23 | 512 | RIPE NCC | RU | 16th Jun 1997 |
| 62.76.48.0/21 | 2k | RIPE NCC | RU | 16th Jun 1997 |
| 62.76.56.0/22 | 1k | RIPE NCC | RU | 16th Jun 1997 |
| 62.76.60.0/23 | 512 | RIPE NCC | RU | 16th Jun 1997 |
| 62.78.0.0/19 | 8.2k | RIPE NCC |  US | 24th Jul 2000 |
| 62.80.64.0/19 | 8.2k | RIPE NCC |  GB | 22nd Jun 2000 |
| 63.132.0.0/16 | 65.5k | ARIN | US | 12th Jun 2002 |
| 63.133.0.0/17 | 32.8k | ARIN | US | 12th Jun 2002 |
| 63.133.212.0/23 | 512 | ARIN | US | 3rd Oct 2023 |
| 63.133.214.0/24 | 256 | ARIN | US | 29th Sept 2023 |
| 63.135.167.0/24 | 256 | ARIN | US | 1st Jun 2020 |
| 63.135.68.0/24 | 256 | ARIN | US | 21st Nov 2003 |
| 63.135.80.0/20 | 4.1k | ARIN | US | 7th Aug 2007 |
| 63.140.16.0/20 | 4.1k | ARIN | US | 10th Dec 2010 |
| 63.141.34.0/23 | 512 | RIPE NCC |  IN | 18th Jan 2011 |
| 63.141.38.0/24 | 256 | ARIN | US | 6th Oct 2026 |
| 63.141.64.0/18 | 16.4k | ARIN | US | 13th Jan 2011 |
| 63.142.0.0/20 | 4.1k | RIPE NCC | DE | 10th Dec 2010 |
| 63.245.192.0/20 | 4.1k | ARIN | US | 25th Aug 2010 |
| 63.246.160.0/19 | 8.2k | RIPE NCC | DE | 25th Oct 2002 |
| 63.247.112.0/20 | 4.1k | ARIN | US | 9th Apr 2007 |
| 63.251.116.0/24 | 256 | ARIN | US | 2nd Dec 1999 |
| 63.251.118.0/23 | 512 | ARIN | US | 2nd Dec 1999 |
| 63.251.121.0/24 | 256 | ARIN | US | 2nd Dec 1999 |
| 63.251.230.0/23 | 512 | ARIN | US | 2nd Dec 1999 |
| 64.110.152.0/24 | 256 | ARIN | US | 19th Jun 2000 |
| 64.110.48.0/23 | 512 | ARIN | US | 11th Jul 2022 |
| 64.111.192.0/19 | 8.2k | ARIN | US | 9th Mar 2005 |
| 64.111.36.0/24 | 256 | ARIN | US | 3rd Mar 2005 |
| 64.111.44.0/24 | 256 | ARIN | US | 3rd Mar 2005 |
| 64.111.58.0/23 | 512 | ARIN | US | 3rd Mar 2005 |
| 64.112.112.0/22 | 1k | ARIN | US | 1st Jul 2021 |
| 64.112.117.0/24 | 256 | ARIN | US | 2nd Jul 2021 |
| 64.112.13.0/24 | 256 | ARIN | US | 6th Apr 2021 |
| 64.112.15.0/24 | 256 | ARIN | US | 28th Apr 2021 |
| 64.112.64.0/24 | 256 | ARIN | US | 31st Aug 2021 |
| 64.112.65.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 64.112.68.0/22 | 1k | ARIN |  CA | 1st Jul 2021 |
| 64.118.51.0/24 | 256 | ARIN | US | 22nd Mar 2024 |
| 64.118.52.0/24 | 256 | ARIN | US | 22nd Mar 2024 |
| 64.119.224.0/20 | 4.1k | ARIN | US | 23rd Aug 2001 |
| 64.127.196.0/22 | 1k | ARIN | US | 26th Feb 2021 |
| 64.133.0.0/16 | 65.5k | ARIN | US | 19th Jul 2000 |