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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 206.126.117.0/24 | 256 | ARIN |  US | 2nd Jul 2026 |
| 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 |