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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,149 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.188.97.0/24 | 256 | ARIN |  US | 24th Jun 1992 |
| 192.188.98.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.189.0.0/24 | 256 | ARIN |  CA | 3rd Oct 2025 |
| 192.189.1.0/24 | 256 | RIPE NCC |  GB | 15th Jun 1992 |
| 192.189.10.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.189.101.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.102.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.103.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.104.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.105.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.106.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.107.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.108.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.109.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.11.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.189.110.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.111.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.114.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.115.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.116.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.119.0/24 | 256 | RIPE NCC | GB | 20th Jul 1992 |
| 192.189.120.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.121.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.122.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.124.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.125.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.126.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.127.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.13.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.133.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.134.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.135.0/24 | 256 | ARIN | US | 20th Jul 1992 |
| 192.189.139.0/24 | 256 | AFRINIC |  GA | 21st Jul 1992 |
| 192.189.140.0/24 | 256 | AFRINIC | GA | 21st Jul 1992 |
| 192.189.149.0/24 | 256 | ARIN | US | 24th Jul 1992 |
| 192.189.15.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.150.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.154.0/24 | 256 | RIPE NCC |  IT | 27th Jul 1992 |
| 192.189.155.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.156.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.158.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.159.0/24 | 256 | APNIC |  AU | 11th Feb 2011 |
| 192.189.16.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.160.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.164.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.165.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.166.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.167.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.168.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |
| 192.189.169.0/24 | 256 | RIPE NCC | GB | 27th Jul 1992 |