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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 206.197.12.0/24 | 256 | ARIN |  US | 19th Jun 1995 |
| 206.197.120.0/24 | 256 | ARIN | US | 27th Jul 1995 |
| 206.197.121.0/24 | 256 | ARIN | US | 28th Jul 1995 |
| 206.197.122.0/24 | 256 | ARIN | US | 28th Jul 1995 |
| 206.197.123.0/24 | 256 | ARIN | US | 31st Jul 1995 |
| 206.197.124.0/24 | 256 | ARIN | US | 31st Jul 1995 |
| 206.197.125.0/24 | 256 | ARIN | US | 31st Jul 1995 |
| 206.197.126.0/24 | 256 | ARIN | US | 1st Aug 1995 |
| 206.197.127.0/24 | 256 | ARIN | US | 1st Aug 1995 |
| 206.197.128.0/24 | 256 | ARIN | US | 1st Aug 1995 |
| 206.197.129.0/24 | 256 | ARIN | US | 1st Aug 1995 |
| 206.197.13.0/24 | 256 | ARIN | US | 19th Jun 1995 |
| 206.197.130.0/24 | 256 | ARIN | US | 1st Aug 1995 |
| 206.197.132.0/24 | 256 | ARIN | US | 2nd Aug 1995 |
| 206.197.134.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.135.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.136.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.137.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.138.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.139.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.14.0/24 | 256 | ARIN | US | 19th Jun 1995 |
| 206.197.140.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.141.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.142.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.143.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.144.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.145.0/24 | 256 | ARIN | US | 3rd Aug 1995 |
| 206.197.147.0/24 | 256 | ARIN | US | 4th Aug 1995 |
| 206.197.148.0/24 | 256 | ARIN | US | 4th Aug 1995 |
| 206.197.149.0/24 | 256 | ARIN | US | 4th Aug 1995 |
| 206.197.15.0/24 | 256 | ARIN | US | 19th Jun 1995 |
| 206.197.150.0/24 | 256 | ARIN | US | 4th Aug 1995 |
| 206.197.151.0/24 | 256 | ARIN |  CA | 4th Aug 1995 |
| 206.197.152.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.153.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.154.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.155.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.157.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.158.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.159.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.16.0/24 | 256 | ARIN | US | 19th Jun 1995 |
| 206.197.160.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.162.0/24 | 256 | ARIN | US | 7th Aug 1995 |
| 206.197.163.0/24 | 256 | ARIN | US | 8th Aug 1995 |
| 206.197.164.0/24 | 256 | ARIN | US | 8th Aug 1995 |
| 206.197.166.0/24 | 256 | ARIN | US | 8th Aug 1995 |
| 206.197.167.0/24 | 256 | ARIN | US | 9th Aug 1995 |
| 206.197.168.0/24 | 256 | ARIN | US | 9th Aug 1995 |
| 206.197.169.0/24 | 256 | ARIN | US | 13th Jan 2006 |
| 206.197.17.0/24 | 256 | ARIN | US | 19th Jun 1995 |