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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.124.150.0/24 | 256 | ARIN |  US | 13th Jan 1992 |
| 192.124.151.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.154.0/24 | 256 | APNIC |  CN | 23rd Sept 1991 |
| 192.124.155.0/24 | 256 | RIPE NCC |  AT | 23rd Sept 1991 |
| 192.124.158.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.159.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.16.0/24 | 256 | ARIN | US | 22nd Nov 1994 |
| 192.124.160.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.161.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.162.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.163.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.164.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.17.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.174.0/24 | 256 | RIPE NCC |  RU | 23rd Sept 1991 |
| 192.124.19.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.20.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.124.208.0/24 | 256 | RIPE NCC | RU | 23rd Sept 1991 |
| 192.124.21.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.210.0/23 | 512 | RIPE NCC | RU | 23rd Sept 1991 |
| 192.124.212.0/22 | 1k | RIPE NCC | RU | 23rd Sept 1991 |
| 192.124.217.0/24 | 256 | RIPE NCC | RU | 23rd Sept 1991 |
| 192.124.218.0/23 | 512 | RIPE NCC | RU | 23rd Sept 1991 |
| 192.124.22.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.229.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.23.0/24 | 256 | ARIN | US | 1st Apr 2015 |
| 192.124.234.0/24 | 256 | ARIN | US | 23rd Sept 1991 |
| 192.124.235.0/24 | 256 | RIPE NCC |  DE | 27th Jan 1992 |
| 192.124.244.0/24 | 256 | RIPE NCC | DE | 19th Mar 1992 |
| 192.124.247.0/24 | 256 | RIPE NCC | DE | 26th May 1992 |
| 192.124.30.0/24 | 256 | ARIN |  CA | 2nd Apr 2015 |
| 192.124.31.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.33.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.36.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.37.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.39.0/24 | 256 | RIPE NCC |  BE | 12th Sept 1991 |
| 192.124.43.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.47.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.49.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.60.0/22 | 1k | ARIN | US | 16th Sept 1991 |
| 192.124.64.0/20 | 4.1k | ARIN | US | 16th Sept 1991 |
| 192.124.80.0/21 | 2k | ARIN | US | 16th Sept 1991 |
| 192.124.88.0/23 | 512 | ARIN | US | 16th Sept 1991 |
| 192.124.9.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.124.90.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.92.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.93.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.94.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.95.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.96.0/24 | 256 | ARIN | US | 16th Sept 1991 |
| 192.124.97.0/24 | 256 | ARIN | US | 16th Sept 1991 |