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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.161.1.0/24 | 256 | RIPE NCC |  VG | 18th Nov 2019 |
| 193.161.116.0/22 | 1k | RIPE NCC |  IT | 18th Jul 2018 |
| 193.161.138.0/23 | 512 | RIPE NCC |  NO | 25th Nov 1993 |
| 193.161.146.0/24 | 256 | RIPE NCC | NO | 17th Mar 1998 |
| 193.161.147.0/24 | 256 | RIPE NCC | VG | 18th Nov 2019 |
| 193.161.152.0/23 | 512 | RIPE NCC | NO | 21st Feb 1994 |
| 193.161.154.0/23 | 512 | RIPE NCC | NO | 21st Feb 1994 |
| 193.161.158.0/23 | 512 | RIPE NCC | NO | 27th Jul 1995 |
| 193.161.194.0/23 | 512 | RIPE NCC | NO | 15th Mar 1994 |
| 193.161.201.0/24 | 256 | RIPE NCC |  HU | 15th Jan 2024 |
| 193.161.207.0/24 | 256 | RIPE NCC | NO | 23rd Jun 1994 |
| 193.161.224.0/21 | 2k | RIPE NCC | NO | 23rd Jun 1994 |
| 193.161.236.0/22 | 1k | RIPE NCC |  SE | 3rd Oct 1994 |
| 193.161.24.0/23 | 512 | RIPE NCC |  CY | 14th Oct 2019 |
| 193.161.240.0/22 | 1k | RIPE NCC |  CH | 2nd Mar 1995 |
| 193.161.244.0/24 | 256 | RIPE NCC | CH | 2nd Mar 1995 |
| 193.161.252.0/24 | 256 | RIPE NCC | NO | 15th Nov 1994 |
| 193.161.253.0/24 | 256 | RIPE NCC | NO | 30th Aug 1994 |
| 193.161.26.0/24 | 256 | RIPE NCC | VG | 18th Nov 2019 |
| 193.161.27.0/24 | 256 | RIPE NCC | NO | 12th Nov 1993 |
| 193.161.28.0/23 | 512 | RIPE NCC | CY | 14th Oct 2019 |
| 193.162.0.0/24 | 256 | RIPE NCC |  DK | 1st Sept 1993 |
| 193.162.100.0/24 | 256 | RIPE NCC |  DE | 4th Feb 2021 |
| 193.162.101.0/24 | 256 | RIPE NCC |  PL | 4th Feb 2021 |
| 193.162.112.0/23 | 512 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.130.0/24 | 256 | RIPE NCC |  RU | 16th Sept 2021 |
| 193.162.139.0/24 | 256 | RIPE NCC | RU | 2nd Dec 2020 |
| 193.162.141.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.142.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 193.162.160.0/21 | 2k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.2.0/23 | 512 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.224.0/20 | 4.1k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.240.0/21 | 2k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.248.0/22 | 1k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.254.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.255.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.32.0/23 | 512 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.36.0/22 | 1k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.4.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.40.0/24 | 256 | RIPE NCC |  TR | 23rd Sept 2020 |
| 193.162.41.0/24 | 256 | RIPE NCC | DE | 23rd Sept 2020 |
| 193.162.42.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.44.0/24 | 256 | RIPE NCC |  GB | 4th May 2021 |
| 193.162.56.0/21 | 2k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.6.0/24 | 256 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.64.0/21 | 2k | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.72.0/23 | 512 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.76.0/23 | 512 | RIPE NCC | DK | 1st Sept 1993 |
| 193.162.78.0/24 | 256 | RIPE NCC |  UA | 12th Oct 2020 |
| 193.162.80.0/20 | 4.1k | RIPE NCC | DK | 1st Sept 1993 |