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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.68.205.0/24 | 256 | ARIN |  US | 5th Jun 1990 |
| 192.68.206.0/24 | 256 | ARIN | US | 6th Jun 1990 |
| 192.68.207.0/24 | 256 | ARIN | US | 6th Jun 1990 |
| 192.68.21.0/24 | 256 | ARIN | US | 15th Feb 1990 |
| 192.68.210.0/24 | 256 | ARIN | US | 6th Jun 1990 |
| 192.68.22.0/24 | 256 | ARIN | US | 19th Jul 2022 |
| 192.68.220.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.68.222.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.68.225.0/24 | 256 | ARIN | US | 11th Jun 1990 |
| 192.68.226.0/24 | 256 | ARIN | US | 12th Jun 1990 |
| 192.68.227.0/24 | 256 | ARIN | US | 13th Jun 1990 |
| 192.68.229.0/24 | 256 | ARIN |  CA | 13th Jun 1990 |
| 192.68.23.0/24 | 256 | RIPE NCC |  GB | 15th Feb 1990 |
| 192.68.233.0/24 | 256 | ARIN | US | 15th Jun 1990 |
| 192.68.25.0/24 | 256 | ARIN | US | 21st Dec 1989 |
| 192.68.250.0/24 | 256 | RIPE NCC |  NL | 4th Jun 1990 |
| 192.68.251.0/24 | 256 | RIPE NCC | NL | 4th Jun 1990 |
| 192.68.252.0/24 | 256 | RIPE NCC | NL | 4th Jun 1990 |
| 192.68.253.0/24 | 256 | ARIN | US | 4th Jun 1990 |
| 192.68.28.0/24 | 256 | ARIN | US | 21st Dec 1989 |
| 192.68.30.0/24 | 256 | ARIN | US | 21st Dec 1989 |
| 192.68.31.0/24 | 256 | RIPE NCC | NL | 23rd Jan 1990 |
| 192.68.32.0/21 | 2k | RIPE NCC | NL | 23rd Jan 1990 |
| 192.68.4.0/24 | 256 | RIPE NCC |  AT | 8th Dec 1992 |
| 192.68.48.0/23 | 512 | RIPE NCC | NL | 23rd Jan 1990 |
| 192.68.5.0/24 | 256 | RIPE NCC |  DE | 12th Feb 1990 |
| 192.68.50.0/24 | 256 | RIPE NCC | NL | 23rd Jan 1990 |
| 192.68.52.0/24 | 256 | ARIN | US | 23rd Jan 1990 |
| 192.68.53.0/24 | 256 | ARIN | CA | 15th Feb 1990 |
| 192.68.54.0/23 | 512 | ARIN | CA | 15th Feb 1990 |
| 192.68.56.0/21 | 2k | ARIN | CA | 15th Feb 1990 |
| 192.68.6.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.64.0/23 | 512 | ARIN | CA | 15th Feb 1990 |
| 192.68.66.0/24 | 256 | ARIN | CA | 15th Feb 1990 |
| 192.68.67.0/24 | 256 | ARIN | CA | 30th Apr 1993 |
| 192.68.7.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.75.0/24 | 256 | ARIN | US | 15th Feb 1990 |
| 192.68.76.0/22 | 1k | RIPE NCC |  NO | 21st Feb 1990 |
| 192.68.8.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.9.0/24 | 256 | RIPE NCC | DE | 12th Feb 1990 |
| 192.68.96.0/21 | 2k | RIPE NCC | NO | 21st Feb 1990 |
| 192.69.0.0/24 | 256 | ARIN | US | 13th Sept 1993 |
| 192.69.101.0/24 | 256 | ARIN | CA | 22nd Jun 2000 |
| 192.69.117.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.69.130.0/23 | 512 | ARIN | US | 18th Nov 2014 |
| 192.69.140.0/24 | 256 | ARIN | US | 18th Aug 2000 |
| 192.69.142.0/24 | 256 | ARIN | US | 6th Jan 1992 |
| 192.69.149.0/24 | 256 | ARIN | US | 3rd Oct 1994 |
| 192.69.150.0/23 | 512 | ARIN | US | 3rd Oct 1994 |
| 192.69.152.0/22 | 1k | ARIN | US | 3rd Oct 1994 |