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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.68.104.0/22 | 1k | RIPE NCC |  NO | 21st Feb 1990 |
| 192.68.109.0/24 | 256 | ARIN |  US | 21st Feb 1990 |
| 192.68.113.0/24 | 256 | ARIN | US | 21st Feb 1990 |
| 192.68.114.0/24 | 256 | ARIN | US | 21st Feb 1990 |
| 192.68.116.0/23 | 512 | ARIN |  CA | 23rd Dec 2024 |
| 192.68.12.0/24 | 256 | RIPE NCC |  DE | 12th Feb 1990 |
| 192.68.124.0/23 | 512 | ARIN | US | 21st Feb 1990 |
| 192.68.13.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.134.0/24 | 256 | ARIN | US | 7th Mar 1990 |
| 192.68.135.0/24 | 256 | ARIN | US | 7th Mar 1990 |
| 192.68.136.0/24 | 256 | RIPE NCC |  NL | 7th Mar 1990 |
| 192.68.137.0/24 | 256 | ARIN | CA | 7th Mar 1990 |
| 192.68.138.0/24 | 256 | AFRINIC |  TN | 7th Mar 1990 |
| 192.68.14.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.141.0/24 | 256 | ARIN | US | 9th Mar 1990 |
| 192.68.142.0/24 | 256 | ARIN | US | 9th Mar 1990 |
| 192.68.145.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.146.0/24 | 256 | ARIN | US | 12th Mar 1990 |
| 192.68.147.0/24 | 256 | ARIN | US | 12th Mar 1990 |
| 192.68.15.0/24 | 256 | RIPE NCC | DE | 28th Oct 1993 |
| 192.68.151.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.68.155.0/24 | 256 | ARIN | US | 13th Mar 1990 |
| 192.68.159.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.16.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.160.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.161.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.162.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.170.0/24 | 256 | RIPE NCC |  GB | 15th Mar 1990 |
| 192.68.173.0/24 | 256 | ARIN | US | 15th Mar 1990 |
| 192.68.174.0/24 | 256 | RIPE NCC | GB | 27th Oct 1992 |
| 192.68.175.0/24 | 256 | ARIN | US | 15th Mar 1990 |
| 192.68.176.0/24 | 256 | RIPE NCC |  IT | 15th Mar 1990 |
| 192.68.178.0/24 | 256 | ARIN | US | 12th Nov 2014 |
| 192.68.18.0/24 | 256 | RIPE NCC | DE | 14th Mar 1990 |
| 192.68.181.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.182.0/24 | 256 | RIPE NCC | NL | 16th Mar 1990 |
| 192.68.183.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.184.0/24 | 256 | ARIN | CA | 24th Mar 1990 |
| 192.68.189.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.19.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.191.0/24 | 256 | ARIN | US | 16th May 1989 |
| 192.68.193.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.195.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.198.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.199.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.20.0/24 | 256 | ARIN | US | 15th Feb 1990 |
| 192.68.200.0/24 | 256 | ARIN | US | 5th Jun 1990 |
| 192.68.201.0/24 | 256 | ARIN | US | 5th Jun 1990 |
| 192.68.202.0/24 | 256 | ARIN | US | 5th Jun 1990 |
| 192.68.203.0/24 | 256 | ARIN | US | 10th Nov 2014 |