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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.120.46.0/24 | 256 | ARIN |  US | 2nd Aug 1991 |
| 192.120.47.0/24 | 256 | ARIN | US | 2nd Aug 1991 |
| 192.120.48.0/23 | 512 | ARIN | US | 2nd Aug 1991 |
| 192.120.5.0/24 | 256 | ARIN | US | 2nd Aug 1991 |
| 192.120.50.0/23 | 512 | ARIN | US | 9th Jul 2021 |
| 192.120.52.0/22 | 1k | ARIN | US | 2nd Aug 1991 |
| 192.120.56.0/23 | 512 | ARIN | US | 2nd Aug 1991 |
| 192.120.58.0/24 | 256 | ARIN | US | 2nd Aug 1991 |
| 192.120.59.0/24 | 256 | ARIN | US | 2nd Aug 1991 |
| 192.120.6.0/23 | 512 | ARIN | US | 2nd Aug 1991 |
| 192.120.60.0/22 | 1k | ARIN | US | 2nd Aug 1991 |
| 192.120.64.0/20 | 4.1k | ARIN | US | 2nd Aug 1991 |
| 192.120.80.0/22 | 1k | ARIN | US | 2nd Aug 1991 |
| 192.120.84.0/24 | 256 | ARIN | US | 2nd Aug 1991 |
| 192.120.85.0/24 | 256 | ARIN | US | 2nd Aug 1991 |
| 192.120.86.0/23 | 512 | ARIN | US | 2nd Aug 1991 |
| 192.120.88.0/21 | 2k | ARIN | US | 2nd Aug 1991 |
| 192.120.96.0/21 | 2k | ARIN | US | 2nd Aug 1991 |
| 192.122.1.0/24 | 256 | RIPE NCC |  GB | 9th Aug 1991 |
| 192.122.128.0/23 | 512 | RIPE NCC | GB | 9th Aug 1991 |
| 192.122.130.0/24 | 256 | RIPE NCC | GB | 9th Aug 1991 |
| 192.122.141.0/24 | 256 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.142.0/23 | 512 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.144.0/23 | 512 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.146.0/24 | 256 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.147.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.122.148.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.122.151.0/24 | 256 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.152.0/21 | 2k | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.16.0/20 | 4.1k | RIPE NCC | GB | 9th Aug 1991 |
| 192.122.160.0/21 | 2k | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.168.0/23 | 512 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.170.0/24 | 256 | RIPE NCC | GB | 27th Aug 1991 |
| 192.122.172.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.122.173.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.122.174.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.122.177.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.122.179.0/24 | 256 | ARIN | US | 2nd Sept 1991 |
| 192.122.181.0/24 | 256 | ARIN | US | 2nd Sept 1991 |
| 192.122.2.0/23 | 512 | RIPE NCC | GB | 9th Aug 1991 |
| 192.122.207.0/24 | 256 | ARIN | US | 3rd Sept 1991 |
| 192.122.208.0/24 | 256 | ARIN | US | 3rd Sept 1991 |
| 192.122.211.0/24 | 256 | ARIN | US | 3rd Sept 1991 |
| 192.122.213.0/24 | 256 | ARIN | US | 2nd Sept 1991 |
| 192.122.214.0/24 | 256 | RIPE NCC | GB | 2nd Sept 1991 |
| 192.122.216.0/24 | 256 | RIPE NCC |  IE | 15th May 1992 |
| 192.122.217.0/24 | 256 | RIPE NCC | GB | 3rd Sept 1991 |
| 192.122.218.0/23 | 512 | RIPE NCC | GB | 3rd Sept 1991 |
| 192.122.220.0/22 | 1k | RIPE NCC | GB | 3rd Sept 1991 |
| 192.122.224.0/21 | 2k | RIPE NCC | GB | 3rd Sept 1991 |