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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.149.222.0/24 | 256 | ARIN |  US | 17th Mar 1992 |
| 192.149.223.0/24 | 256 | ARIN | US | 19th Mar 1992 |
| 192.149.226.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.227.0/24 | 256 | RIPE NCC |  NL | 23rd Mar 1992 |
| 192.149.228.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.235.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.237.0/24 | 256 | ARIN | US | 24th Mar 1992 |
| 192.149.238.0/24 | 256 | RIPE NCC |  GB | 24th Mar 1992 |
| 192.149.25.0/24 | 256 | ARIN | US | 24th Feb 1992 |
| 192.149.27.0/24 | 256 | RIPE NCC |  AT | 25th Feb 1992 |
| 192.149.29.0/24 | 256 | RIPE NCC |  SE | 26th Feb 1992 |
| 192.149.3.0/24 | 256 | RIPE NCC |  PL | 21st Feb 1992 |
| 192.149.30.0/23 | 512 | RIPE NCC | SE | 26th Feb 1992 |
| 192.149.32.0/23 | 512 | RIPE NCC | SE | 26th Feb 1992 |
| 192.149.34.0/24 | 256 | ARIN | US | 26th Feb 1992 |
| 192.149.35.0/24 | 256 | RIPE NCC | SE | 26th Feb 1992 |
| 192.149.36.0/24 | 256 | APNIC |  AU | 26th Feb 1992 |
| 192.149.38.0/24 | 256 | ARIN | US | 27th Feb 1992 |
| 192.149.4.0/24 | 256 | ARIN | US | 21st Feb 1992 |
| 192.149.40.0/24 | 256 | ARIN | US | 26th Feb 1992 |
| 192.149.41.0/24 | 256 | RIPE NCC |  FR | 26th Feb 1992 |
| 192.149.42.0/24 | 256 | ARIN | US | 26th Feb 1992 |
| 192.149.5.0/24 | 256 | RIPE NCC |  FI | 21st Feb 1992 |
| 192.149.53.0/24 | 256 | ARIN |  CA | 5th Mar 1992 |
| 192.149.57.0/24 | 256 | RIPE NCC | GB | 27th Feb 1992 |
| 192.149.59.0/24 | 256 | RIPE NCC | FR | 2nd Mar 1992 |
| 192.149.60.0/24 | 256 | RIPE NCC | GB | 2nd Mar 1992 |
| 192.149.61.0/24 | 256 | ARIN | US | 2nd Mar 1992 |
| 192.149.64.0/23 | 512 | ARIN | US | 19th May 2003 |
| 192.149.66.0/24 | 256 | ARIN | US | 19th May 2003 |
| 192.149.75.0/24 | 256 | ARIN | US | 2nd Mar 1992 |
| 192.149.77.0/24 | 256 | RIPE NCC | FR | 2nd Mar 1992 |
| 192.149.78.0/24 | 256 | RIPE NCC |  NO | 2nd Mar 1992 |
| 192.149.79.0/24 | 256 | RIPE NCC | NO | 2nd Mar 1992 |
| 192.149.8.0/24 | 256 | ARIN | US | 14th May 2015 |
| 192.149.80.0/24 | 256 | ARIN | CA | 2nd Mar 1992 |
| 192.149.82.0/24 | 256 | ARIN | US | 3rd Mar 1992 |
| 192.149.85.0/24 | 256 | ARIN | US | 3rd Mar 1992 |
| 192.149.86.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.149.87.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.149.93.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.150.1.0/24 | 256 | ARIN | US | 25th Jun 1992 |
| 192.150.100.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.150.101.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.150.102.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.150.103.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.150.104.0/24 | 256 | RIPE NCC | PL | 10th Mar 1992 |
| 192.150.106.0/24 | 256 | RIPE NCC | GB | 10th Mar 1992 |
| 192.150.108.0/24 | 256 | ARIN | US | 11th Mar 1992 |
| 192.150.109.0/24 | 256 | ARIN | US | 11th Mar 1992 |