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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 216.52.224.0/21 | 2k | ARIN |  US | 24th Aug 1998 |
| 216.52.233.0/24 | 256 | ARIN | US | 10th Jul 2026 |
| 216.52.235.0/24 | 256 | ARIN | US | 28th Jul 2026 |
| 216.52.236.0/22 | 1k | ARIN | US | 24th Aug 1998 |
| 216.52.242.0/23 | 512 | ARIN | US | 24th Aug 1998 |
| 216.52.245.0/24 | 256 | RIPE NCC |  IL | 24th Aug 1998 |
| 216.52.246.0/23 | 512 | ARIN | US | 24th Aug 1998 |
| 216.52.249.0/24 | 256 | ARIN | US | 5th Aug 2026 |
| 216.52.36.0/22 | 1k | ARIN | US | 24th Aug 1998 |
| 216.52.40.0/22 | 1k | ARIN | US | 24th Aug 1998 |
| 216.52.96.0/22 | 1k | ARIN | US | 24th Aug 1998 |
| 216.57.121.0/24 | 256 | ARIN | US | 12th Aug 2005 |
| 216.58.176.0/20 | 4.1k | ARIN | US | 10th Mar 2005 |
| 216.69.64.0/19 | 8.2k | ARIN | US | 23rd Oct 1998 |
| 216.7.192.0/19 | 8.2k | ARIN |  CA | 7th Feb 2001 |
| 216.7.96.0/20 | 4.1k | ARIN | US | 5th Jan 2001 |
| 216.71.240.0/20 | 4.1k | ARIN | US | 4th May 2005 |
| 216.71.96.0/22 | 1k | ARIN | US | 24th Sept 2018 |
| 216.73.187.0/24 | 256 | ARIN | US | 8th Oct 2021 |
| 216.73.191.0/24 | 256 | ARIN | US | 8th Oct 2021 |
| 216.73.220.0/22 | 1k | ARIN | US | 10th Jun 1999 |
| 216.82.240.0/20 | 4.1k | ARIN | US | 17th Sept 2003 |
| 216.83.96.0/19 | 8.2k | ARIN | US | 15th Sept 2000 |
| 216.87.222.0/24 | 256 | ARIN | CA | 13th Aug 1999 |
| 216.87.55.0/24 | 256 | RIPE NCC |  GB | 9th Jul 1999 |
| 216.9.162.0/24 | 256 | ARIN | US | 27th Jul 2021 |
| 216.9.163.0/24 | 256 | ARIN | US | 18th Oct 1999 |
| 216.9.164.0/24 | 256 | ARIN | US | 2nd Aug 2021 |
| 216.9.32.0/20 | 4.1k | ARIN | US | 12th Oct 1999 |
| 216.98.16.0/20 | 4.1k | ARIN | US | 31st Oct 2000 |
| 216.98.168.0/22 | 1k | ARIN | US | 13th Oct 1998 |
| 216.98.174.0/24 | 256 | ARIN | US | 21st Sept 2016 |
| 216.99.199.0/24 | 256 | ARIN | US | 19th Nov 2015 |
| 216.99.205.0/24 | 256 | ARIN | US | 14th Dec 2015 |
| 216.99.208.0/23 | 512 | ARIN | US | 7th Mar 2016 |
| 216.99.96.0/20 | 4.1k | ARIN | CA | 28th Oct 1998 |
| 217.113.56.0/22 | 1k | RIPE NCC |  HU | 5th Dec 2003 |
| 217.115.138.0/23 | 512 | RIPE NCC |  DE | 1st Feb 2001 |
| 217.115.144.0/24 | 256 | RIPE NCC | DE | 29th May 2001 |
| 217.115.224.0/20 | 4.1k | RIPE NCC |  NL | 5th Feb 2001 |
| 217.118.144.0/20 | 4.1k | RIPE NCC |  IT | 11th Feb 2004 |
| 217.118.16.0/23 | 512 | RIPE NCC | DE | 22nd Nov 2004 |
| 217.118.18.0/24 | 256 | RIPE NCC | DE | 22nd Nov 2004 |
| 217.118.20.0/23 | 512 | RIPE NCC | DE | 22nd Nov 2004 |
| 217.118.22.0/24 | 256 | RIPE NCC | DE | 22nd Nov 2004 |
| 217.118.25.0/24 | 256 | RIPE NCC | DE | 22nd Nov 2004 |
| 217.118.28.0/22 | 1k | RIPE NCC | DE | 22nd Nov 2004 |
| 217.119.130.0/24 | 256 | RIPE NCC | CA | 5th Oct 2021 |
| 217.119.136.0/24 | 256 | RIPE NCC |  BE | 5th Oct 2021 |
| 217.119.48.0/24 | 256 | RIPE NCC | DE | 26th Feb 2004 |