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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.133.58.0/24 | 256 | RIPE NCC |  GB | 7th Nov 1991 |
| 192.133.64.0/24 | 256 | RIPE NCC |  NO | 13th Nov 1991 |
| 192.134.143.0/24 | 256 | RIPE NCC |  FR | 21st Apr 1993 |
| 192.135.133.0/24 | 256 | RIPE NCC |  AT | 11th Dec 1991 |
| 192.135.143.0/24 | 256 | RIPE NCC | NO | 12th Dec 1991 |
| 192.135.145.0/24 | 256 | RIPE NCC |  CH | 1st Sept 1993 |
| 192.135.146.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 192.135.160.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 192.135.164.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 192.135.175.0/24 | 256 | RIPE NCC | FR | 16th Dec 1991 |
| 192.135.225.0/24 | 256 | RIPE NCC |  IE | 30th Dec 1991 |
| 192.135.234.0/24 | 256 | RIPE NCC | GB | 30th Dec 1991 |
| 192.135.46.0/24 | 256 | RIPE NCC | NO | 21st Nov 1991 |
| 192.135.51.0/24 | 256 | RIPE NCC |  DE | 29th Mar 1992 |
| 192.135.52.0/24 | 256 | RIPE NCC | GB | 22nd Nov 1991 |
| 192.135.53.0/24 | 256 | RIPE NCC | GB | 22nd Nov 1991 |
| 192.135.66.0/24 | 256 | RIPE NCC | GB | 26th Nov 1991 |
| 192.135.68.0/24 | 256 | RIPE NCC | GB | 26th Nov 1991 |
| 192.135.82.0/24 | 256 | RIPE NCC |  SE | 3rd Dec 1991 |
| 192.136.100.0/23 | 512 | RIPE NCC |  FI | 16th Sept 2004 |
| 192.136.102.0/24 | 256 | RIPE NCC | FI | 16th Sept 2004 |
| 192.136.154.0/24 | 256 | RIPE NCC | GB | 8th Feb 1992 |
| 192.136.155.0/24 | 256 | RIPE NCC | GB | 8th Feb 1992 |
| 192.136.156.0/24 | 256 | RIPE NCC | CH | 22nd Oct 1992 |
| 192.136.18.0/24 | 256 | RIPE NCC | GB | 19th Dec 1991 |
| 192.136.19.0/24 | 256 | RIPE NCC |  BE | 19th Dec 1991 |
| 192.136.23.0/24 | 256 | RIPE NCC |  NL | 19th Dec 1991 |
| 192.136.29.0/24 | 256 | RIPE NCC | GB | 23rd Dec 1991 |
| 192.136.31.0/24 | 256 | RIPE NCC |  PT | 23rd Dec 1991 |
| 192.136.40.0/24 | 256 | RIPE NCC | GB | 24th Dec 1991 |
| 192.136.41.0/24 | 256 | RIPE NCC | CH | 26th Dec 1991 |
| 192.136.51.0/24 | 256 | RIPE NCC | NL | 30th Dec 1991 |
| 192.136.61.0/24 | 256 | RIPE NCC |  RU | 6th Jan 1992 |
| 192.136.7.0/24 | 256 | RIPE NCC |  MT | 19th Dec 1991 |
| 192.136.71.0/24 | 256 | RIPE NCC | FI | 16th Sept 2004 |
| 192.136.80.0/20 | 4.1k | RIPE NCC | FI | 16th Sept 2004 |
| 192.136.96.0/22 | 1k | RIPE NCC | FI | 16th Sept 2004 |
| 192.138.1.0/24 | 256 | RIPE NCC | GB | 2nd Jan 1992 |
| 192.138.105.0/24 | 256 | RIPE NCC | NO | 7th Jan 1992 |
| 192.138.106.0/23 | 512 | RIPE NCC | NO | 7th Jan 1992 |
| 192.138.108.0/24 | 256 | RIPE NCC | NO | 7th Jan 1992 |
| 192.138.112.0/22 | 1k | RIPE NCC | SE | 7th Jan 1992 |
| 192.138.155.0/24 | 256 | RIPE NCC | NO | 8th Jan 1992 |
| 192.138.156.0/23 | 512 | RIPE NCC | GB | 8th Jan 1992 |
| 192.138.158.0/24 | 256 | RIPE NCC | GB | 8th Jan 1992 |
| 192.138.183.0/24 | 256 | RIPE NCC |  TR | 29th Apr 2024 |
| 192.138.192.0/24 | 256 | RIPE NCC | GB | 15th Jan 1992 |
| 192.138.2.0/23 | 512 | RIPE NCC | GB | 2nd Jan 1992 |
| 192.138.229.0/24 | 256 | RIPE NCC | GB | 17th Jan 1992 |
| 192.138.230.0/24 | 256 | RIPE NCC | CH | 17th Jan 1992 |