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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 138.16.136.0/24 | 256 | RIPE NCC |  RU | 23rd Jan 1990 |
| 138.16.144.0/21 | 2k | RIPE NCC | RU | 23rd Jan 1990 |
| 138.16.208.0/20 | 4.1k | RIPE NCC | RU | 23rd Jan 1990 |
| 138.16.236.0/22 | 1k | RIPE NCC | RU | 23rd Jan 1990 |
| 138.199.64.0/20 | 4.1k | RIPE NCC |  EU | 23rd May 1990 |
| 138.228.0.0/16 | 65.5k | RIPE NCC |  CH | 1st Sept 1993 |
| 139.10.0.0/16 | 65.5k | RIPE NCC |  DE | 1st Sept 1993 |
| 139.100.0.0/23 | 512 | RIPE NCC |  UA | 15th Feb 1990 |
| 139.100.100.0/22 | 1k | RIPE NCC |  US | 15th Feb 1990 |
| 139.100.112.0/20 | 4.1k | RIPE NCC | US | 15th Feb 1990 |
| 139.100.16.0/23 | 512 | RIPE NCC | UA | 15th Feb 1990 |
| 139.100.160.0/20 | 4.1k | RIPE NCC | RU | 15th Feb 1990 |
| 139.100.18.0/23 | 512 | RIPE NCC |  FR | 15th Feb 1990 |
| 139.100.184.0/21 | 2k | RIPE NCC | FR | 15th Feb 1990 |
| 139.100.20.0/22 | 1k | RIPE NCC | FR | 15th Feb 1990 |
| 139.100.24.0/21 | 2k | RIPE NCC | FR | 15th Feb 1990 |
| 139.100.6.0/23 | 512 | RIPE NCC | FR | 15th Feb 1990 |
| 139.100.8.0/21 | 2k | RIPE NCC | FR | 15th Feb 1990 |
| 139.100.96.0/23 | 512 | RIPE NCC |  CR | 15th Feb 1990 |
| 139.100.98.0/24 | 256 | RIPE NCC | FR | 15th Feb 1990 |
| 139.100.99.0/24 | 256 | RIPE NCC | US | 15th Feb 1990 |
| 139.156.0.0/16 | 65.5k | RIPE NCC |  NL | 1st Sept 1993 |
| 139.158.0.0/16 | 65.5k | RIPE NCC | FR | 1st Sept 1993 |
| 139.16.0.0/16 | 65.5k | RIPE NCC | DE | 1st Sept 1993 |
| 139.21.0.0/16 | 65.5k | RIPE NCC | DE | 27th Mar 1993 |
| 139.22.0.0/16 | 65.5k | RIPE NCC | DE | 27th Mar 1993 |
| 139.25.0.0/16 | 65.5k | RIPE NCC | DE | 14th Apr 1993 |
| 139.28.132.0/22 | 1k | RIPE NCC |  HK | 2nd Jan 2019 |
| 139.28.164.0/22 | 1k | RIPE NCC |  BE | 3rd Jan 2019 |
| 139.50.0.0/16 | 65.5k | RIPE NCC | DE | 20th Jun 1990 |
| 139.90.0.0/16 | 65.5k | RIPE NCC | BE | 12th Feb 1990 |
| 141.105.0.0/20 | 4.1k | RIPE NCC | NL | 24th Jun 2011 |
| 141.105.176.0/20 | 4.1k | RIPE NCC |  GB | 28th Jun 2011 |
| 141.133.128.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.129.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.130.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.131.0/24 | 256 | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.134.0/23 | 512 | RIPE NCC |  KG | 27th Oct 1992 |
| 141.133.142.0/23 | 512 | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.144.0/20 | 4.1k | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.160.0/21 | 2k | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.168.0/22 | 1k | RIPE NCC | KG | 27th Oct 1992 |
| 141.133.192.0/19 | 8.2k | RIPE NCC | RU | 27th Oct 1992 |
| 141.133.224.0/19 | 8.2k | RIPE NCC | RU | 27th Oct 1992 |
| 141.16.0.0/16 | 65.5k | RIPE NCC | DE | 1st Sept 1993 |
| 141.170.224.0/19 | 8.2k | RIPE NCC | UA | 4th Jul 2011 |
| 141.226.132.0/24 | 256 | RIPE NCC |  IL | 5th Aug 1990 |
| 141.226.133.0/24 | 256 | RIPE NCC | IL | 5th Aug 1990 |
| 141.226.134.0/24 | 256 | RIPE NCC | IL | 5th Aug 1990 |
| 141.226.135.0/24 | 256 | RIPE NCC | DE | 5th Aug 1990 |