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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,778 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 91.208.151.0/24 | 256 | RIPE NCC |  HR | 7th Nov 2019 |
| 91.208.152.0/24 | 256 | RIPE NCC |  IT | 19th Aug 2008 |
| 91.208.153.0/24 | 256 | RIPE NCC |  UA | 19th Aug 2008 |
| 91.208.156.0/24 | 256 | RIPE NCC |  SA | 20th Aug 2008 |
| 91.208.169.0/24 | 256 | RIPE NCC |  AT | 27th Aug 2008 |
| 91.208.176.0/23 | 512 | RIPE NCC |  PL | 3rd Oct 2019 |
| 91.208.180.0/24 | 256 | RIPE NCC |  CH | 1st Sept 2008 |
| 91.208.190.0/24 | 256 | RIPE NCC |  GB | 13th Apr 2026 |
| 91.208.196.0/24 | 256 | RIPE NCC |  NL | 9th Sept 2008 |
| 91.208.203.0/24 | 256 | RIPE NCC |  KW | 11th Sept 2008 |
| 91.208.212.0/24 | 256 | RIPE NCC |  LU | 17th Dec 2025 |
| 91.208.218.0/24 | 256 | RIPE NCC |  IL | 22nd Sept 2008 |
| 91.208.220.0/24 | 256 | RIPE NCC |  BE | 29th Sept 2008 |
| 91.208.230.0/24 | 256 | APNIC |  NZ | 7th Nov 2019 |
| 91.208.234.0/24 | 256 | RIPE NCC |  RO | 25th Sept 2008 |
| 91.208.236.0/24 | 256 | RIPE NCC |  US | 7th Nov 2019 |
| 91.208.240.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.241.0/24 | 256 | RIPE NCC | NL | 26th Sept 2008 |
| 91.208.245.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.246.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.30.0/24 | 256 | RIPE NCC | CH | 7th Jul 2008 |
| 91.208.46.0/24 | 256 | RIPE NCC |  DE | 7th Nov 2019 |
| 91.208.48.0/24 | 256 | RIPE NCC | DE | 7th Nov 2019 |
| 91.208.49.0/24 | 256 | RIPE NCC | NL | 11th Jul 2008 |
| 91.208.63.0/24 | 256 | RIPE NCC |  BG | 16th May 2012 |
| 91.208.64.0/24 | 256 | RIPE NCC | DE | 7th Nov 2019 |
| 91.208.67.0/24 | 256 | RIPE NCC | NL | 27th Sept 2023 |
| 91.208.69.0/24 | 256 | RIPE NCC | US | 7th Nov 2019 |
| 91.208.70.0/24 | 256 | RIPE NCC |  TR | 21st Jul 2008 |
| 91.208.77.0/24 | 256 | RIPE NCC | NL | 15th May 2023 |
| 91.208.90.0/24 | 256 | RIPE NCC | RO | 30th Jul 2008 |
| 91.208.91.0/24 | 256 | RIPE NCC | US | 30th Jul 2008 |
| 91.208.99.0/24 | 256 | RIPE NCC | DE | 1st Aug 2008 |
| 91.209.1.0/24 | 256 | RIPE NCC |  SI | 7th Apr 2010 |
| 91.209.100.0/24 | 256 | RIPE NCC | GB | 7th Nov 2019 |
| 91.209.117.0/24 | 256 | RIPE NCC | NL | 25th Aug 2025 |
| 91.209.134.0/24 | 256 | RIPE NCC | CH | 19th Nov 2008 |
| 91.209.138.0/24 | 256 | RIPE NCC | UA | 20th Nov 2008 |
| 91.209.14.0/24 | 256 | RIPE NCC | NL | 7th Nov 2019 |
| 91.209.142.0/24 | 256 | RIPE NCC | GB | 8th Aug 2012 |
| 91.209.144.0/24 | 256 | RIPE NCC | GB | 20th Nov 2008 |
| 91.209.15.0/24 | 256 | RIPE NCC |  FR | 13th Oct 2008 |
| 91.209.164.0/24 | 256 | RIPE NCC | NL | 1st Oct 2010 |
| 91.209.170.0/24 | 256 | RIPE NCC | CH | 2nd Dec 2008 |
| 91.209.176.0/24 | 256 | RIPE NCC | UA | 3rd Dec 2008 |
| 91.209.179.0/24 | 256 | RIPE NCC |  CA | 7th Nov 2019 |
| 91.209.187.0/24 | 256 | RIPE NCC | GB | 10th Dec 2008 |
| 91.209.195.0/24 | 256 | RIPE NCC | RO | 15th Dec 2008 |
| 91.209.200.0/24 | 256 | RIPE NCC | GB | 15th Dec 2008 |
| 91.209.204.0/24 | 256 | RIPE NCC | CH | 16th Dec 2008 |