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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.54.198.0/24 | 256 | RIPE NCC |  FR | 15th Jun 1989 |
| 192.54.199.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.203.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.211.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.212.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.213.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.214.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.219.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.221.0/24 | 256 | RIPE NCC |  DE | 14th Jun 1989 |
| 192.54.225.0/24 | 256 | RIPE NCC |  SE | 15th Jun 1989 |
| 192.54.226.0/24 | 256 | ARIN |  US | 15th Jun 1989 |
| 192.54.228.0/24 | 256 | ARIN | US | 19th Jun 1989 |
| 192.54.230.0/23 | 512 | ARIN | US | 20th Jun 1989 |
| 192.54.232.0/22 | 1k | ARIN | US | 20th Jun 1989 |
| 192.54.236.0/23 | 512 | ARIN | US | 20th Jun 1989 |
| 192.54.238.0/24 | 256 | ARIN | US | 20th Jun 1989 |
| 192.54.239.0/24 | 256 | ARIN | US | 20th Jun 1989 |
| 192.54.24.0/22 | 1k | ARIN | US | 18th May 1989 |
| 192.54.241.0/24 | 256 | ARIN | US | 26th Jun 1990 |
| 192.54.244.0/24 | 256 | RIPE NCC |  GB | 12th Nov 2019 |
| 192.54.245.0/24 | 256 | RIPE NCC | GB | 23rd Jun 1989 |
| 192.54.246.0/24 | 256 | ARIN | US | 26th Jun 1989 |
| 192.54.248.0/24 | 256 | ARIN | US | 27th Jun 1989 |
| 192.54.249.0/24 | 256 | ARIN | US | 28th Jun 1989 |
| 192.54.250.0/24 | 256 | ARIN | US | 26th Jun 1990 |
| 192.54.253.0/24 | 256 | ARIN | US | 26th Jun 1990 |
| 192.54.254.0/24 | 256 | RIPE NCC | DE | 5th Jul 1989 |
| 192.54.28.0/23 | 512 | ARIN | US | 18th May 1989 |
| 192.54.30.0/24 | 256 | ARIN | US | 18th May 1989 |
| 192.54.31.0/24 | 256 | RIPE NCC | DE | 29th Aug 1989 |
| 192.54.32.0/24 | 256 | RIPE NCC | DE | 29th Aug 1989 |
| 192.54.33.0/24 | 256 | RIPE NCC | DE | 29th Aug 1989 |
| 192.54.37.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.38.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.40.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.46.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.47.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.50.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.51.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.52.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.54.0/23 | 512 | RIPE NCC |  RS | 4th Oct 2019 |
| 192.54.61.0/24 | 256 | RIPE NCC | DE | 1st Jan 1984 |
| 192.54.62.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.63.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.64.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.65.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.72.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.54.74.0/24 | 256 | RIPE NCC | DE | 30th Mar 1994 |
| 192.54.75.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |
| 192.54.78.0/24 | 256 | RIPE NCC | DE | 22nd May 1989 |