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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,019 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.209.107.0/24 | 256 | ARIN |  US | 22nd Dec 2022 |
| 206.209.108.0/22 | 1k | ARIN | US | 12th Jun 2007 |
| 206.209.128.0/20 | 4.1k | ARIN | US | 11th Sept 1995 |
| 206.209.144.0/20 | 4.1k | ARIN | US | 11th Sept 1995 |
| 206.209.16.0/20 | 4.1k | ARIN | US | 22nd Aug 1995 |
| 206.209.176.0/20 | 4.1k | ARIN | US | 14th Sept 1995 |
| 206.209.192.0/20 | 4.1k | ARIN | US | 18th Sept 1995 |
| 206.209.214.0/23 | 512 | ARIN | US | 19th Sept 1995 |
| 206.209.32.0/20 | 4.1k | ARIN | US | 29th Aug 1995 |
| 206.209.48.0/20 | 4.1k | ARIN | US | 29th Aug 1995 |
| 206.209.64.0/21 | 2k | ARIN | US | 31st Aug 1995 |
| 206.209.72.0/22 | 1k | ARIN | US | 31st Aug 1995 |
| 206.209.80.0/20 | 4.1k | ARIN | US | 31st Aug 1995 |
| 206.209.96.0/23 | 512 | ARIN | US | 12th Jun 2007 |
| 206.209.98.0/23 | 512 | ARIN | US | 19th Dec 2022 |
| 206.211.0.0/19 | 8.2k | ARIN | US | 20th Sept 1995 |
| 206.211.218.0/23 | 512 | ARIN | US | 28th Sept 1995 |
| 206.211.224.0/19 | 8.2k | ARIN | US | 3rd Oct 1995 |
| 206.211.96.0/19 | 8.2k | ARIN | US | 27th Sept 1995 |
| 206.212.192.0/19 | 8.2k | ARIN | US | 24th Aug 1995 |
| 206.215.0.0/16 | 65.5k | ARIN | US | 31st Aug 1995 |
| 206.217.144.0/20 | 4.1k | ARIN | US | 24th Aug 2010 |
| 206.218.128.0/19 | 8.2k | ARIN | US | 14th Sept 1995 |
| 206.218.160.0/20 | 4.1k | ARIN | US | 14th Sept 1995 |
| 206.218.176.0/22 | 1k | ARIN | US | 14th Sept 1995 |
| 206.218.182.0/24 | 256 | ARIN | US | 14th Sept 1995 |
| 206.218.183.0/24 | 256 | ARIN | US | 14th Sept 1995 |
| 206.218.184.0/21 | 2k | ARIN | US | 14th Sept 1995 |
| 206.218.64.0/18 | 16.4k | ARIN | US | 12th Sept 1995 |
| 206.220.0.0/22 | 1k | ARIN | US | 22nd Sept 1995 |
| 206.220.104.0/22 | 1k | ARIN | US | 20th Oct 1995 |
| 206.220.108.0/22 | 1k | ARIN | US | 20th Oct 1995 |
| 206.220.116.0/22 | 1k | ARIN | US | 25th Oct 1995 |
| 206.220.128.0/22 | 1k | ARIN | US | 7th Nov 1995 |
| 206.220.136.0/22 | 1k | ARIN | US | 10th Nov 1995 |
| 206.220.144.0/22 | 1k | ARIN | US | 13th Nov 1995 |
| 206.220.148.0/22 | 1k | ARIN | US | 14th Nov 1995 |
| 206.220.152.0/22 | 1k | ARIN | US | 27th Nov 1995 |
| 206.220.168.0/22 | 1k | ARIN | US | 15th Dec 1995 |
| 206.220.184.0/22 | 1k | ARIN | US | 5th Oct 2016 |
| 206.220.20.0/22 | 1k | ARIN | US | 3rd Oct 1995 |
| 206.220.204.0/22 | 1k | ARIN | US | 7th Mar 1996 |
| 206.220.208.0/22 | 1k | ARIN | US | 20th May 1996 |
| 206.220.212.0/22 | 1k | ARIN | US | 1st Jul 1996 |
| 206.220.224.0/22 | 1k | ARIN | US | 22nd Jul 1996 |
| 206.220.28.0/22 | 1k | ARIN | US | 5th Oct 1995 |
| 206.220.36.0/22 | 1k | ARIN | US | 5th Oct 1995 |
| 206.220.4.0/22 | 1k | ARIN | US | 25th Sept 1995 |
| 206.220.40.0/22 | 1k | ARIN | US | 6th Oct 1995 |
| 206.220.52.0/22 | 1k | ARIN | US | 9th Oct 1995 |