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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.6.207.0/24 | 256 | ARIN |  US | 26th Aug 1983 |
| 192.6.208.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.209.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.210.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.211.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.212.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.213.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.214.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.215.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.216.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.218.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.22.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.220.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.222.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.223.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.224.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.225.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.226.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.23.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.230.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.232.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.234.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.235.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.236.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.237.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.238.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.240.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.241.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.246.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.248.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.249.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.28.0/22 | 1k | ARIN | US | 26th Aug 1983 |
| 192.6.3.0/24 | 256 | ARIN | US | 28th Feb 2001 |
| 192.6.32.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.36.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.37.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.38.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.4.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.42.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.44.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.46.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.48.0/22 | 1k | ARIN | US | 10th Oct 2022 |
| 192.6.52.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.53.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.54.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.56.0/23 | 512 | ARIN | US | 26th Aug 1983 |
| 192.6.6.0/24 | 256 | ARIN | US | 26th Aug 1983 |
| 192.6.60.0/22 | 1k | ARIN | US | 26th Aug 1983 |
| 192.6.7.0/24 | 256 | ARIN | US | 28th Feb 2001 |
| 192.6.70.0/23 | 512 | ARIN | US | 26th Aug 1983 |