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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.81.90.0/23 | 512 | ARIN |  US | 12th Dec 2014 |
| 192.81.92.0/22 | 1k | ARIN | US | 28th Dec 2012 |
| 192.81.97.0/24 | 256 | ARIN | US | 27th Oct 1993 |
| 192.82.100.0/24 | 256 | APNIC |  MN | 30th May 1990 |
| 192.82.101.0/24 | 256 | ARIN | US | 1st Jun 1990 |
| 192.82.103.0/24 | 256 | ARIN | US | 1st Jun 1990 |
| 192.82.105.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.82.108.0/24 | 256 | ARIN | US | 15th Jun 1990 |
| 192.82.110.0/24 | 256 | ARIN | US | 15th Jun 1990 |
| 192.82.112.0/24 | 256 | ARIN | US | 15th Jun 1990 |
| 192.82.115.0/24 | 256 | ARIN | US | 22nd Mar 2017 |
| 192.82.116.0/24 | 256 | ARIN | US | 16th Jul 1990 |
| 192.82.117.0/24 | 256 | ARIN |  CA | 16th Jul 1990 |
| 192.82.121.0/24 | 256 | RIPE NCC |  GB | 16th Jul 1990 |
| 192.82.123.0/24 | 256 | ARIN | US | 24th Jul 1990 |
| 192.82.124.0/24 | 256 | RIPE NCC | GB | 30th Jul 1990 |
| 192.82.125.0/24 | 256 | ARIN | US | 24th Jul 1990 |
| 192.82.136.0/23 | 512 | ARIN | US | 17th Sept 2013 |
| 192.82.138.0/24 | 256 | ARIN | US | 17th Sept 2013 |
| 192.82.141.0/24 | 256 | ARIN | US | 30th Jul 1990 |
| 192.82.142.0/24 | 256 | AFRINIC |  ZA | 30th Jul 1990 |
| 192.82.143.0/24 | 256 | APNIC |  AU | 30th Jul 1990 |
| 192.82.147.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.148.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.149.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.151.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.154.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.155.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.158.0/24 | 256 | RIPE NCC |  AT | 3rd Aug 1990 |
| 192.82.159.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.160.0/24 | 256 | ARIN | US | 3rd Aug 1990 |
| 192.82.161.0/24 | 256 | APNIC | AU | 3rd Aug 1990 |
| 192.82.212.0/24 | 256 | ARIN | US | 10th Aug 1990 |
| 192.82.213.0/24 | 256 | ARIN | US | 10th Aug 1990 |
| 192.82.215.0/24 | 256 | ARIN | US | 13th Aug 1990 |
| 192.82.223.0/24 | 256 | ARIN | US | 13th Aug 1990 |
| 192.82.224.0/24 | 256 | ARIN | US | 13th Aug 1990 |
| 192.82.225.0/24 | 256 | ARIN | US | 13th Aug 1990 |
| 192.82.226.0/24 | 256 | ARIN | US | 13th Aug 1990 |
| 192.82.227.0/24 | 256 | ARIN | US | 13th Aug 1990 |
| 192.82.228.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.229.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.231.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.233.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.234.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.235.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.236.0/24 | 256 | ARIN | US | 22nd Aug 1990 |
| 192.82.237.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.82.238.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.82.239.0/24 | 256 | ARIN | US | 26th Mar 1990 |