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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,449 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.195.169.0/24 | 256 | ARIN |  US | 30th Jul 1992 |
| 192.195.171.0/24 | 256 | ARIN | US | 30th Jul 1992 |
| 192.195.172.0/24 | 256 | ARIN | US | 30th Jul 1992 |
| 192.195.174.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 192.195.175.0/24 | 256 | ARIN | US | 30th Jul 1992 |
| 192.195.178.0/23 | 512 | ARIN | US | 31st Jul 1992 |
| 192.195.180.0/23 | 512 | ARIN | US | 31st Jul 1992 |
| 192.195.182.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.195.187.0/24 | 256 | ARIN | US | 25th Nov 1995 |
| 192.195.188.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.195.189.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.195.190.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.195.191.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.195.192.0/23 | 512 | ARIN | US | 8th Jul 1997 |
| 192.195.194.0/24 | 256 | ARIN | US | 8th Jul 1997 |
| 192.195.199.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.20.0/23 | 512 | ARIN | US | 10th Jul 1992 |
| 192.195.200.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.201.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.202.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.205.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.206.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.207.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.211.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.213.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.217.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.218.0/24 | 256 | ARIN | US | 5th Aug 1992 |
| 192.195.22.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.195.222.0/24 | 256 | ARIN | US | 6th Aug 1992 |
| 192.195.223.0/24 | 256 | ARIN | US | 6th Aug 1992 |
| 192.195.224.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.195.23.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.195.231.0/24 | 256 | ARIN | US | 6th Aug 1992 |
| 192.195.232.0/24 | 256 | ARIN | US | 6th Aug 1992 |
| 192.195.235.0/24 | 256 | ARIN | US | 7th Aug 1992 |
| 192.195.238.0/24 | 256 | ARIN | US | 7th Aug 1992 |
| 192.195.239.0/24 | 256 | ARIN | US | 7th Aug 1992 |
| 192.195.243.0/24 | 256 | ARIN | US | 7th Aug 1992 |
| 192.195.244.0/24 | 256 | ARIN | US | 7th Aug 1992 |
| 192.195.245.0/24 | 256 | ARIN | US | 7th Aug 1992 |
| 192.195.246.0/24 | 256 | ARIN | US | 11th Aug 1992 |
| 192.195.247.0/24 | 256 | ARIN | US | 11th Aug 1992 |
| 192.195.252.0/24 | 256 | ARIN | US | 11th Aug 1992 |
| 192.195.254.0/24 | 256 | ARIN | US | 12th Aug 1992 |
| 192.195.28.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.195.33.0/24 | 256 | ARIN | US | 14th Jul 1992 |
| 192.195.35.0/24 | 256 | ARIN | US | 14th Jul 1992 |
| 192.195.37.0/24 | 256 | ARIN | US | 15th Jul 1992 |
| 192.195.38.0/24 | 256 | ARIN | US | 15th Jul 1992 |
| 192.195.41.0/24 | 256 | ARIN | US | 15th Jul 1992 |