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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,783 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 91.142.137.0/24 | 256 | RIPE NCC |  PL | 12th Apr 2010 |
| 91.142.176.0/20 | 4.1k | RIPE NCC |  DE | 19th Oct 2006 |
| 91.142.192.0/20 | 4.1k | RIPE NCC | PL | 19th Oct 2006 |
| 91.143.240.0/20 | 4.1k | RIPE NCC | DE | 8th Nov 2006 |
| 91.145.128.0/18 | 16.4k | RIPE NCC | PL | 3rd Oct 2006 |
| 91.146.104.0/21 | 2k | RIPE NCC | DE | 8th Sept 2011 |
| 91.146.192.0/18 | 16.4k | RIPE NCC | PL | 24th Oct 2006 |
| 91.148.162.0/23 | 512 | RIPE NCC |  BG | 13th Nov 2006 |
| 91.148.164.0/23 | 512 | RIPE NCC | BG | 13th Nov 2006 |
| 91.148.170.0/23 | 512 | RIPE NCC | BG | 13th Nov 2006 |
| 91.148.172.0/22 | 1k | RIPE NCC | BG | 13th Nov 2006 |
| 91.149.32.0/20 | 4.1k | RIPE NCC |  SE | 14th Nov 2006 |
| 91.150.128.0/19 | 8.2k | RIPE NCC | PL | 19th Dec 2006 |
| 91.150.224.0/19 | 8.2k | RIPE NCC |  DK | 17th Apr 2007 |
| 91.151.32.0/20 | 4.1k | RIPE NCC |  RU | 5th Dec 2006 |
| 91.184.254.0/23 | 512 | RIPE NCC | RU | 16th Oct 2006 |
| 91.188.200.0/22 | 1k | RIPE NCC |  AT | 20th Nov 2018 |
| 91.188.216.0/22 | 1k | RIPE NCC |  TR | 20th Nov 2018 |
| 91.189.184.0/22 | 1k | RIPE NCC | AT | 25th Jun 2018 |
| 91.189.188.0/22 | 1k | RIPE NCC |  BH | 25th Jun 2018 |
| 91.189.48.0/21 | 2k | RIPE NCC | RU | 11th Jan 2007 |
| 91.190.152.0/24 | 256 | RIPE NCC |  HK | 20th Aug 2021 |
| 91.190.216.0/21 | 2k | RIPE NCC |  LU | 12th Aug 2011 |
| 91.190.248.0/21 | 2k | RIPE NCC | DE | 11th Jan 2007 |
| 91.191.128.0/20 | 4.1k | RIPE NCC | SE | 28th Nov 2006 |
| 91.192.16.0/22 | 1k | RIPE NCC |  GB | 26th Jan 2007 |
| 91.192.161.0/24 | 256 | RIPE NCC |  LV | 13th Oct 2025 |
| 91.192.163.0/24 | 256 | RIPE NCC | DE | 13th Oct 2025 |
| 91.192.225.0/24 | 256 | RIPE NCC | PL | 15th Mar 2007 |
| 91.192.227.0/24 | 256 | RIPE NCC |  MK | 15th Mar 2007 |
| 91.192.232.0/22 | 1k | RIPE NCC | GB | 16th Mar 2007 |
| 91.192.248.0/22 | 1k | RIPE NCC | PL | 20th Mar 2007 |
| 91.192.52.0/22 | 1k | RIPE NCC | DK | 6th Feb 2007 |
| 91.192.8.0/24 | 256 | RIPE NCC |  GE | 11th May 2020 |
| 91.192.88.0/22 | 1k | RIPE NCC | PL | 13th Feb 2007 |
| 91.193.108.0/23 | 512 | RIPE NCC | GB | 14th Sept 2009 |
| 91.193.113.0/24 | 256 | RIPE NCC | DE | 15th May 2020 |
| 91.193.115.0/24 | 256 | RIPE NCC |  NL | 15th May 2020 |
| 91.193.144.0/22 | 1k | RIPE NCC | PL | 16th Apr 2007 |
| 91.193.20.0/22 | 1k | RIPE NCC |  CH | 23rd Mar 2007 |
| 91.193.204.0/22 | 1k | RIPE NCC |  UA | 3rd May 2007 |
| 91.193.25.0/24 | 256 | RIPE NCC | RU | 7th Aug 2023 |
| 91.193.36.0/22 | 1k | RIPE NCC | RU | 27th Mar 2007 |
| 91.193.72.0/24 | 256 | RIPE NCC | DE | 4th Jun 2012 |
| 91.193.75.0/24 | 256 | RIPE NCC |  RS | 4th Jun 2012 |
| 91.193.76.0/22 | 1k | RIPE NCC | UA | 3rd Apr 2007 |
| 91.193.90.0/24 | 256 | RIPE NCC | CH | 7th Aug 2023 |
| 91.193.91.0/24 | 256 | RIPE NCC |  FR | 7th Aug 2023 |
| 91.193.92.0/22 | 1k | RIPE NCC |  ES | 5th Apr 2007 |
| 91.194.114.0/23 | 512 | RIPE NCC |  IL | 18th Jun 2007 |