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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.16.141.0/24 | 256 | RIPE NCC |  SE | 22nd Jul 1986 |
| 192.16.142.0/24 | 256 | RIPE NCC | SE | 22nd Jul 1986 |
| 192.16.147.0/24 | 256 | RIPE NCC | SE | 12th Sept 1996 |
| 192.16.154.0/24 | 256 | RIPE NCC | SE | 26th Oct 1992 |
| 192.16.183.0/24 | 256 | RIPE NCC |  NL | 7th Nov 1986 |
| 192.16.187.0/24 | 256 | RIPE NCC | NL | 7th Nov 1986 |
| 192.16.193.0/24 | 256 | RIPE NCC | NL | 7th Nov 1986 |
| 192.16.198.0/24 | 256 | RIPE NCC | NL | 7th Nov 1986 |
| 192.160.10.0/24 | 256 | RIPE NCC |  RU | 8th Nov 2023 |
| 192.160.106.0/24 | 256 | RIPE NCC | NL | 15th Apr 1993 |
| 192.160.109.0/24 | 256 | RIPE NCC |  GB | 18th May 1992 |
| 192.160.110.0/24 | 256 | RIPE NCC |  PL | 18th May 1992 |
| 192.160.123.0/24 | 256 | RIPE NCC |  FR | 20th May 1992 |
| 192.160.126.0/24 | 256 | RIPE NCC |  NO | 21st May 1992 |
| 192.160.143.0/24 | 256 | RIPE NCC | GB | 22nd May 1992 |
| 192.160.152.0/24 | 256 | RIPE NCC | NL | 27th May 1992 |
| 192.160.160.0/24 | 256 | RIPE NCC |  IT | 27th May 1992 |
| 192.160.177.0/24 | 256 | RIPE NCC | GB | 2nd Jun 1992 |
| 192.160.178.0/24 | 256 | RIPE NCC | GB | 2nd Jun 1992 |
| 192.160.179.0/24 | 256 | RIPE NCC | GB | 2nd Jun 1992 |
| 192.160.195.0/24 | 256 | RIPE NCC | GB | 8th Jun 1992 |
| 192.160.21.0/24 | 256 | RIPE NCC |  TR | 22nd Apr 1992 |
| 192.160.225.0/24 | 256 | RIPE NCC | NO | 1st Sept 1993 |
| 192.160.23.0/24 | 256 | RIPE NCC | NO | 1st Apr 2005 |
| 192.160.231.0/24 | 256 | RIPE NCC |  AT | 11th Jun 1992 |
| 192.160.232.0/24 | 256 | RIPE NCC | AT | 11th Jun 1992 |
| 192.160.252.0/24 | 256 | RIPE NCC |  IL | 29th Oct 1993 |
| 192.160.27.0/24 | 256 | RIPE NCC | IT | 24th Apr 1992 |
| 192.160.33.0/24 | 256 | RIPE NCC |  ES | 27th Apr 1992 |
| 192.160.37.0/24 | 256 | RIPE NCC | IT | 27th Apr 1992 |
| 192.160.65.0/24 | 256 | RIPE NCC |  DE | 12th May 1992 |
| 192.160.67.0/24 | 256 | RIPE NCC | AT | 12th May 1992 |
| 192.160.95.0/24 | 256 | RIPE NCC |  CH | 18th May 1992 |
| 192.160.96.0/24 | 256 | RIPE NCC | CH | 18th May 1992 |
| 192.161.64.0/24 | 256 | RIPE NCC |  BE | 27th Apr 1992 |
| 192.161.65.0/24 | 256 | RIPE NCC | BE | 27th Apr 1992 |
| 192.162.176.0/22 | 1k | RIPE NCC | PL | 6th Apr 2011 |
| 192.162.18.0/24 | 256 | RIPE NCC | GB | 25th Mar 2011 |
| 192.164.168.0/22 | 1k | RIPE NCC | AT | 1st Sept 1993 |
| 192.164.36.0/23 | 512 | RIPE NCC | AT | 1st Sept 1993 |
| 192.166.128.0/22 | 1k | RIPE NCC |  UA | 7th Mar 2011 |
| 192.166.140.0/22 | 1k | RIPE NCC | FR | 10th Mar 2011 |
| 192.166.152.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.158.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.16.0/21 | 2k | RIPE NCC | DE | 7th May 1992 |
| 192.166.24.0/22 | 1k | RIPE NCC | DE | 7th May 1992 |
| 192.166.242.0/23 | 512 | RIPE NCC | AT | 6th Jul 2018 |
| 192.166.253.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.254.0/24 | 256 | RIPE NCC | DE | 7th May 1992 |
| 192.166.28.0/22 | 1k | RIPE NCC | DE | 7th May 1992 |