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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.130.226.0/24 | 256 | ARIN |  CA | 16th Oct 1995 |
| 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 |