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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
25,269 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 141.226.139.0/24 | 256 | RIPE NCC |  IL | 5th Aug 1990 |
| 141.226.250.0/23 | 512 | RIPE NCC | IL | 5th Aug 1990 |
| 141.226.84.0/23 | 512 | RIPE NCC |  BG | 5th Aug 1990 |
| 141.226.86.0/24 | 256 | RIPE NCC | BG | 5th Aug 1990 |
| 141.245.0.0/16 | 65.5k | RIPE NCC |  GB | 10th Aug 1990 |
| 141.8.216.0/21 | 2k | RIPE NCC | GB | 23rd Jun 2011 |
| 141.97.0.0/16 | 65.5k | RIPE NCC | GB | 24th Feb 1993 |
| 141.98.92.0/22 | 1k | RIPE NCC |  BZ | 11th Jan 2019 |
| 141.98.96.0/22 | 1k | RIPE NCC |  NL | 11th Jan 2019 |
| 142.228.52.0/22 | 1k | RIPE NCC |  FI | 30th Dec 1992 |
| 142.99.24.0/21 | 2k | RIPE NCC |  CA | 7th Jan 1992 |
| 143.217.0.0/16 | 65.5k | RIPE NCC |  SE | 30th Jun 1990 |
| 143.223.177.0/24 | 256 | RIPE NCC |  NO | 30th Jun 1990 |
| 143.237.0.0/16 | 65.5k | RIPE NCC | SE | 23rd Oct 1990 |
| 143.246.160.0/21 | 2k | RIPE NCC |  IT | 26th Oct 1990 |
| 143.246.168.0/21 | 2k | RIPE NCC | IL | 26th Oct 1990 |
| 143.246.248.0/21 | 2k | RIPE NCC | IL | 26th Oct 1990 |
| 143.246.36.0/22 | 1k | RIPE NCC |  AE | 26th Oct 1990 |
| 143.51.0.0/17 | 32.8k | RIPE NCC | FI | 28th Aug 1990 |
| 143.99.0.0/17 | 32.8k | RIPE NCC |  DE | 7th Sept 1990 |
| 144.119.0.0/16 | 65.5k | RIPE NCC | NL | 3rd Dec 1990 |
| 144.145.0.0/16 | 65.5k | RIPE NCC | DE | 12th Dec 1990 |
| 144.165.0.0/16 | 65.5k | RIPE NCC |  FR | 1st Apr 2005 |
| 144.176.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.178.117.0/24 | 256 | RIPE NCC |  CH | 2nd Dec 1992 |
| 144.178.254.0/24 | 256 | RIPE NCC | CH | 2nd Dec 1992 |
| 144.179.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.180.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.181.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.2.172.0/22 | 1k | RIPE NCC | NL | 1st Sept 1993 |
| 144.2.192.0/19 | 8.2k | RIPE NCC |  US | 1st Sept 1993 |
| 144.249.0.0/17 | 32.8k | RIPE NCC | US | 11th Jan 1991 |
| 144.54.0.0/16 | 65.5k | RIPE NCC | NL | 13th Nov 1990 |
| 144.98.0.0/16 | 65.5k | RIPE NCC |  HK | 1st Jan 1984 |
| 145.11.128.0/17 | 32.8k | RIPE NCC | NL | 1st Sept 1993 |
| 145.11.16.0/21 | 2k | RIPE NCC |  AT | 1st Sept 1993 |
| 145.112.0.0/14 | 262k | RIPE NCC | NL | 1st Sept 1993 |
| 145.131.48.0/20 | 4.1k | RIPE NCC | NL | 1st Sept 1993 |
| 145.134.0.0/15 | 131k | RIPE NCC | NL | 1st Sept 1993 |
| 145.14.130.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 145.16.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.224.48.0/20 | 4.1k | RIPE NCC | CH | 6th May 1993 |
| 145.227.0.0/16 | 65.5k | RIPE NCC | GB | 13th Oct 1993 |
| 145.229.0.0/16 | 65.5k | RIPE NCC | GB | 7th Jun 1993 |
| 145.231.0.0/16 | 65.5k | RIPE NCC | FR | 9th Jun 1993 |
| 145.252.0.0/16 | 65.5k | RIPE NCC | CH | 10th Nov 1993 |
| 145.255.224.0/21 | 2k | RIPE NCC | DE | 23rd Nov 2011 |
| 145.26.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.27.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 145.40.0.0/20 | 4.1k | RIPE NCC | NL | 1st Sept 1993 |