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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,479 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.126.118.0/24 | 256 | ARIN |  US | 2nd Jul 2026 |
| 206.126.119.0/24 | 256 | ARIN | US | 25th Feb 1996 |
| 206.126.192.0/21 | 2k | ARIN | US | 10th Oct 1995 |
| 206.126.225.0/24 | 256 | ARIN |  CA | 8th Jul 2013 |
| 206.126.232.0/23 | 512 | ARIN | US | 4th Aug 2015 |
| 206.126.235.0/24 | 256 | ARIN | US | 3rd Dec 2013 |
| 206.126.240.0/24 | 256 | ARIN |  NL | 13th Dec 2013 |
| 206.126.64.0/21 | 2k | ARIN | US | 9th Oct 1995 |
| 206.127.128.0/21 | 2k | ARIN | US | 17th Oct 1995 |
| 206.127.160.0/21 | 2k | ARIN | US | 17th Oct 1995 |
| 206.128.112.0/21 | 2k | ARIN | US | 10th May 1995 |
| 206.128.192.0/20 | 4.1k | ARIN | US | 10th May 1995 |
| 206.128.208.0/21 | 2k | ARIN | US | 10th May 1995 |
| 206.128.220.0/22 | 1k | ARIN | US | 10th May 1995 |
| 206.128.224.0/19 | 8.2k | ARIN | US | 10th May 1995 |
| 206.128.32.0/19 | 8.2k | ARIN | US | 10th May 1995 |
| 206.13.128.0/17 | 32.8k | ARIN | US | 15th May 1995 |
| 206.130.1.0/24 | 256 | ARIN | CA | 2nd Oct 1995 |
| 206.130.10.0/24 | 256 | ARIN | US | 29th Jan 2014 |
| 206.130.11.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.130.12.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.130.13.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.130.14.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.130.149.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.130.15.0/24 | 256 | ARIN | CA | 12th Feb 2014 |
| 206.130.150.0/24 | 256 | ARIN | CA | 26th Oct 1995 |
| 206.130.154.0/24 | 256 | ARIN | CA | 31st Oct 1995 |
| 206.130.155.0/24 | 256 | ARIN | CA | 24th Oct 1995 |
| 206.130.156.0/23 | 512 | ARIN | CA | 24th Oct 1995 |
| 206.130.158.0/24 | 256 | ARIN | CA | 24th Oct 1995 |
| 206.130.159.0/24 | 256 | ARIN | CA | 25th Oct 1995 |
| 206.130.175.0/24 | 256 | ARIN | CA | 18th Oct 1995 |
| 206.130.177.0/24 | 256 | ARIN | CA | 18th Oct 1995 |
| 206.130.180.0/24 | 256 | ARIN | CA | 20th Oct 1995 |
| 206.130.181.0/24 | 256 | ARIN | CA | 20th Oct 1995 |
| 206.130.182.0/24 | 256 | ARIN | CA | 20th Oct 1995 |
| 206.130.184.0/24 | 256 | ARIN | CA | 23rd Oct 1995 |
| 206.130.185.0/24 | 256 | ARIN | CA | 23rd Oct 1995 |
| 206.130.186.0/24 | 256 | ARIN | CA | 23rd Oct 1995 |
| 206.130.187.0/24 | 256 | ARIN | CA | 19th Oct 1995 |
| 206.130.188.0/24 | 256 | ARIN | CA | 19th Oct 1995 |
| 206.130.2.0/23 | 512 | ARIN |  GB | 17th Aug 2011 |
| 206.130.20.0/24 | 256 | ARIN | CA | 1st Nov 1995 |
| 206.130.21.0/24 | 256 | ARIN | CA | 1st Nov 1995 |
| 206.130.221.0/24 | 256 | ARIN | CA | 16th Oct 1995 |
| 206.130.222.0/24 | 256 | ARIN | CA | 16th Oct 1995 |
| 206.130.223.0/24 | 256 | ARIN | CA | 16th Oct 1995 |
| 206.130.224.0/24 | 256 | ARIN | CA | 17th Oct 1995 |
| 206.130.225.0/24 | 256 | ARIN | CA | 16th Oct 1995 |
| 206.130.226.0/24 | 256 | ARIN | CA | 16th Oct 1995 |