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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,149 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.207.130.0/23 | 512 | ARIN |  US | 29th Aug 1992 |
| 192.207.132.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.133.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.134.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.135.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.136.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.137.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.139.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.140.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.141.0/24 | 256 | RIPE NCC |  GB | 29th Aug 1992 |
| 192.207.142.0/24 | 256 | RIPE NCC |  LU | 29th Aug 1992 |
| 192.207.144.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.145.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.148.0/23 | 512 | ARIN | US | 1st Sept 1992 |
| 192.207.15.0/24 | 256 | ARIN | US | 12th Aug 1992 |
| 192.207.150.0/24 | 256 | ARIN | US | 1st Sept 1992 |
| 192.207.159.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.160.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.161.0/24 | 256 | APNIC |  AU | 4th Sept 1992 |
| 192.207.163.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.164.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.165.0/24 | 256 | APNIC | AU | 4th Sept 1992 |
| 192.207.166.0/23 | 512 | ARIN | US | 4th Sept 1992 |
| 192.207.168.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.169.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.17.0/24 | 256 | ARIN | US | 12th Aug 1992 |
| 192.207.170.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.171.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.172.0/24 | 256 | ARIN | US | 4th Sept 1992 |
| 192.207.179.0/24 | 256 | ARIN | US | 8th Sept 1992 |
| 192.207.18.0/24 | 256 | ARIN | US | 4th May 2015 |
| 192.207.180.0/24 | 256 | ARIN | US | 8th Sept 1992 |
| 192.207.181.0/24 | 256 | ARIN | US | 8th Sept 1992 |
| 192.207.182.0/24 | 256 | ARIN | US | 9th Sept 1992 |
| 192.207.183.0/24 | 256 | LACNIC |  GT | 10th Sept 1992 |
| 192.207.185.0/24 | 256 | ARIN | US | 10th Sept 1992 |
| 192.207.186.0/24 | 256 | ARIN | US | 10th Sept 1992 |
| 192.207.188.0/24 | 256 | ARIN | US | 10th Sept 1992 |
| 192.207.190.0/23 | 512 | ARIN | US | 10th Sept 1992 |
| 192.207.192.0/24 | 256 | ARIN | US | 10th Sept 1992 |
| 192.207.199.0/24 | 256 | ARIN | US | 10th Sept 1992 |
| 192.207.20.0/24 | 256 | ARIN | US | 13th Aug 1992 |
| 192.207.207.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.207.208.0/24 | 256 | ARIN | US | 23rd Dec 1992 |
| 192.207.209.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.207.210.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.207.211.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.207.212.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.207.217.0/24 | 256 | ARIN | US | 11th Sept 1992 |
| 192.207.218.0/24 | 256 | ARIN | US | 11th Sept 1992 |