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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,702 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 91.193.20.0/22 | 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 |
| 91.193.74.0/24 | 256 | RIPE NCC | PL | 7th Nov 2019 |
| 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 |
| 91.194.148.0/24 | 256 | RIPE NCC |  AT | 22nd Sept 2021 |
| 91.194.150.0/23 | 512 | RIPE NCC | GB | 21st Jun 2006 |
| 91.194.158.0/23 | 512 | RIPE NCC | GB | 26th Jun 2007 |
| 91.194.160.0/23 | 512 | RIPE NCC |  MD | 26th Jun 2007 |
| 91.194.164.0/23 | 512 | RIPE NCC | RU | 27th Jun 2007 |
| 91.194.186.0/23 | 512 | RIPE NCC |  SE | 5th Jul 2007 |
| 91.194.206.0/23 | 512 | RIPE NCC | RU | 10th Jul 2007 |
| 91.194.218.0/23 | 512 | RIPE NCC | NL | 16th Jul 2007 |
| 91.194.32.0/23 | 512 | RIPE NCC |  US | 24th May 2007 |
| 91.194.4.0/23 | 512 | RIPE NCC | ES | 14th May 2007 |
| 91.194.40.0/23 | 512 | RIPE NCC | UA | 14th Sept 2009 |
| 91.194.42.0/23 | 512 | RIPE NCC | GB | 25th May 2007 |
| 91.194.6.0/24 | 256 | RIPE NCC |  IR | 28th Jan 2026 |
| 91.194.64.0/23 | 512 | RIPE NCC | RU | 5th Jun 2007 |
| 91.194.94.0/23 | 512 | RIPE NCC | DK | 16th Apr 2008 |
| 91.195.104.0/23 | 512 | RIPE NCC | DE | 7th Sept 2007 |
| 91.195.110.0/24 | 256 | RIPE NCC |  AM | 10th Sept 2007 |
| 91.195.111.0/24 | 256 | RIPE NCC | AM | 10th Sept 2007 |
| 91.195.148.0/23 | 512 | RIPE NCC | RU | 21st Sept 2007 |
| 91.195.160.0/23 | 512 | RIPE NCC | NL | 25th Sept 2007 |
| 91.195.166.0/23 | 512 | RIPE NCC | GB | 26th Sept 2007 |
| 91.195.174.0/23 | 512 | RIPE NCC |  IE | 3rd Oct 2019 |
| 91.195.182.0/23 | 512 | RIPE NCC | GB | 2nd Oct 2007 |
| 91.195.186.0/23 | 512 | RIPE NCC | GB | 3rd Oct 2007 |
| 91.195.192.0/23 | 512 | RIPE NCC | GB | 4th Oct 2007 |
| 91.195.194.0/24 | 256 | RIPE NCC |  RO | 8th Oct 2007 |
| 91.195.208.0/23 | 512 | RIPE NCC | IE | 3rd Oct 2019 |
| 91.195.236.0/23 | 512 | RIPE NCC | NL | 23rd Oct 2007 |