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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.197.86.0/24 | 256 | ARIN |  CA | 26th Oct 1992 |
| 192.197.91.0/24 | 256 | ARIN | CA | 21st Jul 2015 |
| 192.197.94.0/24 | 256 | ARIN | CA | 4th Dec 1992 |
| 192.198.16.0/21 | 2k | ARIN |  US | 7th Apr 1997 |
| 192.198.187.0/24 | 256 | ARIN | US | 7th Mar 2013 |
| 192.198.224.0/20 | 4.1k | ARIN | US | 31st Jul 2013 |
| 192.198.28.0/24 | 256 | ARIN | US | 22nd Dec 2015 |
| 192.198.72.0/22 | 1k | ARIN | US | 11th Aug 1992 |
| 192.198.76.0/23 | 512 | ARIN | US | 11th Aug 1992 |
| 192.198.78.0/24 | 256 | ARIN | US | 11th Aug 1992 |
| 192.199.0.0/24 | 256 | ARIN | CA | 24th Jul 2015 |
| 192.199.1.0/24 | 256 | ARIN | US | 6th Aug 1992 |
| 192.199.128.0/19 | 8.2k | ARIN | US | 7th Aug 1992 |
| 192.199.16.0/20 | 4.1k | RIPE NCC |  PT | 4th Aug 1992 |
| 192.199.160.0/20 | 4.1k | ARIN | US | 7th Aug 1992 |
| 192.199.176.0/23 | 512 | ARIN | US | 7th Aug 1992 |
| 192.199.2.0/23 | 512 | ARIN | US | 6th Aug 1992 |
| 192.199.4.0/22 | 1k | ARIN | US | 6th Aug 1992 |
| 192.199.8.0/23 | 512 | ARIN | US | 6th Aug 1992 |
| 192.2.0.0/16 | 65.5k | RIPE NCC |  GB | 4th Jan 1989 |
| 192.20.192.0/19 | 8.2k | ARIN | US | 27th Nov 1985 |
| 192.20.224.0/24 | 256 | ARIN | US | 27th Nov 1985 |
| 192.20.226.0/23 | 512 | ARIN | US | 27th Nov 1985 |
| 192.20.228.0/22 | 1k | ARIN | US | 27th Nov 1985 |
| 192.20.232.0/22 | 1k | ARIN | US | 27th Nov 1985 |
| 192.20.236.0/23 | 512 | ARIN | US | 27th Nov 1985 |
| 192.20.238.0/24 | 256 | ARIN | US | 27th Nov 1985 |
| 192.20.239.0/24 | 256 | ARIN | US | 27th Nov 1985 |
| 192.200.16.0/20 | 4.1k | ARIN | US | 25th Sept 2012 |
| 192.200.32.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.33.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.34.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.35.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.36.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.37.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.38.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.39.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.40.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.41.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.42.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.43.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.44.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.45.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.46.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.47.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.48.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.49.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.50.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.51.0/24 | 256 | ARIN | US | 22nd Jul 1992 |
| 192.200.52.0/24 | 256 | ARIN | US | 22nd Jul 1992 |