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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.54.125.0/24 | 256 | RIPE NCC |  DE | 19th Aug 1996 |
| 192.54.126.0/23 | 512 | RIPE NCC | DE | 19th Aug 1996 |
| 192.54.128.0/24 | 256 | RIPE NCC | DE | 19th Aug 1996 |
| 192.54.130.0/24 | 256 | APNIC |  NZ | 8th Jun 1989 |
| 192.54.131.0/24 | 256 | ARIN |  US | 8th Jun 1989 |
| 192.54.132.0/24 | 256 | RIPE NCC |  CH | 8th Jun 1989 |
| 192.54.134.0/24 | 256 | ARIN | US | 8th Jun 1989 |
| 192.54.137.0/24 | 256 | APNIC |  AU | 7th Feb 2011 |
| 192.54.138.0/24 | 256 | ARIN | US | 12th Jun 1989 |
| 192.54.139.0/24 | 256 | RIPE NCC | DE | 13th Oct 2000 |
| 192.54.141.0/24 | 256 | RIPE NCC |  FR | 15th Jun 1989 |
| 192.54.142.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.146.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.147.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.148.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.149.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.54.150.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.151.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.152.0/24 | 256 | RIPE NCC | FR | 1st Sept 1992 |
| 192.54.153.0/24 | 256 | RIPE NCC | FR | 21st Oct 1992 |
| 192.54.154.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.155.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.156.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.157.0/24 | 256 | RIPE NCC | FR | 2nd May 1994 |
| 192.54.158.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.159.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.16.0/21 | 2k | ARIN | US | 18th May 1989 |
| 192.54.162.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.163.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.165.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.166.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.167.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.168.0/24 | 256 | RIPE NCC | FR | 1st Sept 1993 |
| 192.54.169.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.170.0/24 | 256 | RIPE NCC | FR | 1st Jan 1984 |
| 192.54.171.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.172.0/24 | 256 | RIPE NCC | FR | 13th Apr 1994 |
| 192.54.173.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.177.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.178.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.179.0/24 | 256 | RIPE NCC | FR | 25th Jan 1993 |
| 192.54.180.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.181.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.182.0/23 | 512 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.184.0/23 | 512 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.188.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.189.0/24 | 256 | RIPE NCC | FR | 5th Apr 1993 |
| 192.54.191.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |
| 192.54.196.0/24 | 256 | RIPE NCC | FR | 8th Apr 1993 |
| 192.54.197.0/24 | 256 | RIPE NCC | FR | 15th Jun 1989 |