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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 206.130.227.0/24 | 256 | ARIN |  CA | 2nd Oct 1995 |
| 206.130.229.0/24 | 256 | ARIN | CA | 2nd Oct 1995 |
| 206.130.23.0/24 | 256 | ARIN | CA | 1st Nov 1995 |
| 206.130.230.0/23 | 512 | ARIN | CA | 3rd Oct 1995 |
| 206.130.232.0/24 | 256 | ARIN | CA | 3rd Oct 1995 |
| 206.130.233.0/24 | 256 | ARIN | CA | 3rd Oct 1995 |
| 206.130.234.0/23 | 512 | ARIN | CA | 3rd Oct 1995 |
| 206.130.236.0/24 | 256 | ARIN | CA | 3rd Oct 1995 |
| 206.130.237.0/24 | 256 | ARIN | CA | 3rd Oct 1995 |
| 206.130.24.0/24 | 256 | ARIN | CA | 3rd Nov 1995 |
| 206.130.240.0/24 | 256 | ARIN | CA | 3rd Oct 1995 |
| 206.130.242.0/24 | 256 | ARIN | CA | 3rd Oct 1995 |
| 206.130.243.0/24 | 256 | ARIN |  US | 21st Oct 2015 |
| 206.130.246.0/23 | 512 | ARIN | CA | 28th Sept 1995 |
| 206.130.248.0/22 | 1k | ARIN | CA | 28th Sept 1995 |
| 206.130.252.0/23 | 512 | ARIN | CA | 27th Sept 1995 |
| 206.130.254.0/24 | 256 | ARIN | CA | 23rd Oct 1995 |
| 206.130.255.0/24 | 256 | ARIN | CA | 26th Apr 2012 |
| 206.130.26.0/24 | 256 | ARIN | CA | 7th Nov 1995 |
| 206.130.27.0/24 | 256 | ARIN | CA | 2nd Nov 1995 |
| 206.130.28.0/24 | 256 | ARIN | CA | 8th Nov 1995 |
| 206.130.29.0/24 | 256 | ARIN | CA | 8th Nov 1995 |
| 206.130.30.0/23 | 512 | ARIN | CA | 6th Nov 1995 |
| 206.130.32.0/22 | 1k | ARIN | CA | 6th Nov 1995 |
| 206.130.37.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.130.39.0/24 | 256 | ARIN | CA | 8th Nov 1995 |
| 206.130.40.0/24 | 256 | ARIN | CA | 13th Nov 1995 |
| 206.130.41.0/24 | 256 | ARIN | CA | 8th Nov 1995 |
| 206.130.42.0/24 | 256 | ARIN | CA | 14th Nov 1995 |
| 206.130.44.0/24 | 256 | ARIN | CA | 10th Nov 1995 |
| 206.130.45.0/24 | 256 | ARIN | CA | 14th Nov 1995 |
| 206.130.46.0/24 | 256 | ARIN | CA | 13th Nov 1995 |
| 206.130.47.0/24 | 256 | ARIN | CA | 13th Nov 1995 |
| 206.130.48.0/24 | 256 | ARIN | CA | 15th Nov 1995 |
| 206.130.5.0/24 | 256 | ARIN | US | 6th Aug 2018 |
| 206.130.50.0/24 | 256 | ARIN | CA | 17th Nov 1995 |
| 206.130.51.0/24 | 256 | ARIN | CA | 21st Nov 1995 |
| 206.130.53.0/24 | 256 | ARIN | CA | 30th Nov 1995 |
| 206.130.54.0/24 | 256 | ARIN | CA | 22nd Nov 1995 |
| 206.130.55.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.130.56.0/24 | 256 | ARIN | CA | 27th Nov 1995 |
| 206.130.57.0/24 | 256 | ARIN | CA | 29th Nov 1995 |
| 206.130.59.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.130.6.0/24 | 256 | ARIN | US | 7th Oct 2015 |
| 206.130.60.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.130.61.0/24 | 256 | ARIN |  GB | 10th Feb 2011 |
| 206.130.66.0/24 | 256 | ARIN | CA | 6th Dec 1995 |
| 206.130.67.0/24 | 256 | ARIN | CA | 22nd Dec 1995 |
| 206.130.68.0/22 | 1k | ARIN | CA | 12th Dec 1995 |
| 206.130.7.0/24 | 256 | ARIN | CA | 26th Oct 1995 |