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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.189.17.0/24 | 256 | ARIN |  US | 17th Jun 1992 |
| 192.189.170.0/24 | 256 | RIPE NCC |  GB | 27th Jul 1992 |
| 192.189.172.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.173.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.174.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.175.0/24 | 256 | ARIN | US | 27th Jul 1992 |
| 192.189.178.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.18.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.181.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.182.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.188.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.189.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.19.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.190.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.191.0/24 | 256 | ARIN | US | 28th Jul 1992 |
| 192.189.195.0/24 | 256 | ARIN | US | 22nd Jul 2020 |
| 192.189.20.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.200.0/23 | 512 | ARIN | US | 6th Apr 2015 |
| 192.189.202.0/24 | 256 | RIPE NCC | GB | 30th Jul 1992 |
| 192.189.203.0/24 | 256 | RIPE NCC | GB | 30th Jul 1992 |
| 192.189.206.0/24 | 256 | ARIN | US | 29th Jul 1992 |
| 192.189.212.0/24 | 256 | ARIN | US | 30th Jul 1992 |
| 192.189.213.0/24 | 256 | ARIN | US | 30th Jul 1992 |
| 192.189.214.0/24 | 256 | ARIN | US | 30th Jul 1992 |
| 192.189.22.0/24 | 256 | ARIN |  CA | 18th Jun 1992 |
| 192.189.221.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.222.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.223.0/24 | 256 | APNIC |  PH | 31st Jul 1992 |
| 192.189.224.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.225.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.226.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.227.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.228.0/24 | 256 | ARIN | US | 31st Jul 1992 |
| 192.189.229.0/24 | 256 | APNIC |  AU | 31st Jul 1992 |
| 192.189.23.0/24 | 256 | RIPE NCC | GB | 18th Jun 1992 |
| 192.189.230.0/24 | 256 | APNIC | AU | 24th Jan 2011 |
| 192.189.231.0/24 | 256 | APNIC | AU | 10th Feb 2011 |
| 192.189.232.0/24 | 256 | APNIC | AU | 7th Feb 2011 |
| 192.189.236.0/24 | 256 | ARIN | US | 4th Aug 1992 |
| 192.189.238.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.239.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.240.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.241.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.242.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.243.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.245.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.246.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.250.0/24 | 256 | ARIN | US | 3rd Aug 1992 |
| 192.189.251.0/24 | 256 | RIPE NCC |  DE | 3rd Aug 1992 |
| 192.189.254.0/24 | 256 | ARIN | US | 3rd Aug 1992 |