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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 206.223.31.0/24 | 256 | ARIN |  US | 16th Oct 1995 |
| 206.223.32.0/24 | 256 | ARIN | US | 16th Oct 1995 |
| 206.223.33.0/24 | 256 | ARIN | US | 17th Oct 1995 |
| 206.223.34.0/24 | 256 | ARIN | US | 17th Oct 1995 |
| 206.223.35.0/24 | 256 | ARIN | US | 17th Oct 1995 |
| 206.223.37.0/24 | 256 | ARIN | US | 18th Oct 1995 |
| 206.223.38.0/24 | 256 | ARIN | US | 18th Oct 1995 |
| 206.223.39.0/24 | 256 | ARIN | US | 18th Oct 1995 |
| 206.223.4.0/24 | 256 | ARIN | US | 6th Oct 1995 |
| 206.223.40.0/24 | 256 | ARIN | US | 18th Oct 1995 |
| 206.223.41.0/24 | 256 | ARIN | US | 19th Oct 1995 |
| 206.223.42.0/24 | 256 | ARIN | US | 19th Oct 1995 |
| 206.223.43.0/24 | 256 | ARIN | US | 19th Oct 1995 |
| 206.223.44.0/24 | 256 | ARIN | US | 23rd Oct 1995 |
| 206.223.45.0/24 | 256 | ARIN | US | 23rd Oct 1995 |
| 206.223.46.0/24 | 256 | ARIN | US | 24th Oct 1995 |
| 206.223.47.0/24 | 256 | ARIN | US | 25th Oct 1995 |
| 206.223.49.0/24 | 256 | ARIN | US | 6th Nov 1995 |
| 206.223.5.0/24 | 256 | ARIN | US | 6th Oct 1995 |
| 206.223.52.0/24 | 256 | ARIN | US | 6th Nov 1995 |
| 206.223.53.0/24 | 256 | ARIN | US | 6th Nov 1995 |
| 206.223.54.0/24 | 256 | ARIN | US | 7th Nov 1995 |
| 206.223.55.0/24 | 256 | ARIN | US | 7th Nov 1995 |
| 206.223.56.0/24 | 256 | ARIN | US | 9th Nov 1995 |
| 206.223.57.0/24 | 256 | ARIN | US | 10th Nov 1995 |
| 206.223.58.0/24 | 256 | ARIN | US | 10th Nov 1995 |
| 206.223.59.0/24 | 256 | ARIN | US | 10th Nov 1995 |
| 206.223.60.0/24 | 256 | ARIN | US | 25th Jul 2022 |
| 206.223.61.0/24 | 256 | ARIN | US | 13th Nov 1995 |
| 206.223.62.0/24 | 256 | ARIN | US | 13th Nov 1995 |
| 206.223.63.0/24 | 256 | ARIN | US | 17th Nov 1995 |
| 206.223.65.0/24 | 256 | ARIN | US | 17th Nov 1995 |
| 206.223.66.0/24 | 256 | ARIN | US | 17th Nov 1995 |
| 206.223.68.0/24 | 256 | ARIN | US | 21st Nov 1995 |
| 206.223.69.0/24 | 256 | ARIN | US | 22nd Nov 1995 |
| 206.223.7.0/24 | 256 | ARIN | US | 6th Oct 1995 |
| 206.223.70.0/24 | 256 | ARIN | US | 27th Nov 1995 |
| 206.223.71.0/24 | 256 | ARIN | US | 27th Nov 1995 |
| 206.223.72.0/24 | 256 | ARIN | US | 27th Nov 1995 |
| 206.223.74.0/24 | 256 | ARIN | US | 28th Nov 1995 |
| 206.223.75.0/24 | 256 | ARIN | US | 1st Dec 1995 |
| 206.223.76.0/24 | 256 | ARIN | US | 4th Dec 1995 |
| 206.223.77.0/24 | 256 | ARIN | US | 4th Dec 1995 |
| 206.223.79.0/24 | 256 | ARIN | US | 6th Dec 1995 |
| 206.223.80.0/24 | 256 | ARIN | US | 8th Dec 1995 |
| 206.223.81.0/24 | 256 | ARIN | US | 11th Dec 1995 |
| 206.223.82.0/24 | 256 | ARIN | US | 11th Dec 1995 |
| 206.223.83.0/24 | 256 | ARIN | US | 20th Dec 1995 |
| 206.223.85.0/24 | 256 | ARIN | US | 16th Jan 1996 |
| 206.223.86.0/24 | 256 | ARIN | US | 24th Jan 1996 |