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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.148.32.0/24 | 256 | ARIN |  US | 19th Feb 1992 |
| 192.148.33.0/24 | 256 | RIPE NCC |  SE | 19th Feb 1992 |
| 192.148.34.0/23 | 512 | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.36.0/22 | 1k | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.40.0/21 | 2k | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.48.0/20 | 4.1k | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.80.0/21 | 2k | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.88.0/22 | 1k | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.92.0/24 | 256 | RIPE NCC | SE | 19th Feb 1992 |
| 192.148.98.0/24 | 256 | ARIN | US | 25th Feb 1992 |
| 192.148.99.0/24 | 256 | ARIN | US | 25th Feb 1992 |
| 192.149.1.0/24 | 256 | ARIN | US | 21st Feb 1992 |
| 192.149.100.0/24 | 256 | RIPE NCC |  NO | 6th Mar 1992 |
| 192.149.101.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.102.0/24 | 256 | RIPE NCC | NO | 6th Mar 1992 |
| 192.149.105.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.149.106.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.149.108.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.149.110.0/24 | 256 | RIPE NCC |  IT | 6th Mar 1992 |
| 192.149.112.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.113.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.114.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.116.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.118.0/24 | 256 | RIPE NCC |  NL | 10th Mar 1992 |
| 192.149.121.0/24 | 256 | RIPE NCC |  GB | 10th Mar 1992 |
| 192.149.122.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.123.0/24 | 256 | ARIN |  CA | 10th Mar 1992 |
| 192.149.124.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.126.0/24 | 256 | RIPE NCC |  DE | 10th Mar 1992 |
| 192.149.127.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.149.136.0/23 | 512 | ARIN | US | 12th Mar 1992 |
| 192.149.138.0/24 | 256 | ARIN | US | 12th Mar 1992 |
| 192.149.139.0/24 | 256 | ARIN | US | 12th Mar 1992 |
| 192.149.14.0/24 | 256 | ARIN | US | 21st Feb 1992 |
| 192.149.146.0/24 | 256 | ARIN | US | 12th Mar 1992 |
| 192.149.148.0/24 | 256 | ARIN | US | 13th Mar 1992 |
| 192.149.151.0/24 | 256 | ARIN | US | 13th Mar 1992 |
| 192.149.152.0/21 | 2k | ARIN | US | 11th Dec 1996 |
| 192.149.160.0/19 | 8.2k | ARIN | US | 11th Dec 1996 |
| 192.149.18.0/24 | 256 | ARIN | US | 24th Feb 1992 |
| 192.149.19.0/24 | 256 | RIPE NCC |  ES | 24th Feb 1992 |
| 192.149.192.0/21 | 2k | ARIN | US | 11th Dec 1996 |
| 192.149.200.0/23 | 512 | ARIN | US | 11th Dec 1996 |
| 192.149.203.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.204.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.208.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.211.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.212.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.220.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.221.0/24 | 256 | ARIN | US | 17th Mar 1992 |