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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,871 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 77.81.50.0/23 | 512 | RIPE NCC |  CH | 15th Feb 2007 |
| 77.81.8.0/21 | 2k | RIPE NCC |  ES | 15th Feb 2007 |
| 77.81.90.0/23 | 512 | RIPE NCC |  GB | 15th Feb 2007 |
| 77.83.152.0/22 | 1k | RIPE NCC |  RU | 13th Dec 2018 |
| 77.83.156.0/22 | 1k | RIPE NCC |  AT | 13th Dec 2018 |
| 77.83.164.0/22 | 1k | RIPE NCC |  RO | 13th Dec 2018 |
| 77.83.168.0/22 | 1k | RIPE NCC | RO | 13th Dec 2018 |
| 77.83.236.0/22 | 1k | RIPE NCC |  DE | 14th Dec 2018 |
| 77.87.136.0/21 | 2k | RIPE NCC |  PL | 27th Jun 2007 |
| 77.87.168.0/21 | 2k | RIPE NCC | RU | 10th Jul 2007 |
| 77.87.186.0/24 | 256 | RIPE NCC | DE | 16th Jul 2007 |
| 77.87.56.0/21 | 2k | RIPE NCC |  NL | 14th May 2007 |
| 77.88.128.0/18 | 16.4k | RIPE NCC | PL | 15th Mar 2007 |
| 77.91.208.0/24 | 256 | RIPE NCC | RU | 11th Jun 2026 |
| 77.91.209.0/24 | 256 | RIPE NCC |  FI | 23rd May 2007 |
| 77.91.210.0/23 | 512 | RIPE NCC | FI | 23rd May 2007 |
| 77.91.212.0/22 | 1k | RIPE NCC |  DK | 23rd May 2007 |
| 77.91.232.0/21 | 2k | RIPE NCC | DE | 23rd May 2007 |
| 77.91.72.0/22 | 1k | RIPE NCC | RU | 25th Apr 2007 |
| 77.94.228.0/23 | 512 | RIPE NCC |  FR | 21st Jun 2007 |
| 77.95.168.0/24 | 256 | RIPE NCC |  PT | 17th Jan 2025 |
| 77.95.169.0/24 | 256 | RIPE NCC | RU | 17th Jan 2025 |
| 77.95.171.0/24 | 256 | RIPE NCC |  UA | 17th Jan 2025 |
| 77.95.173.0/24 | 256 | RIPE NCC | UA | 17th Jan 2025 |
| 77.95.20.0/22 | 1k | RIPE NCC | RU | 24th May 2007 |
| 77.95.217.0/24 | 256 | RIPE NCC |  TR | 18th Feb 2025 |
| 77.95.224.0/24 | 256 | RIPE NCC | NL | 9th Aug 2011 |
| 77.95.225.0/24 | 256 | RIPE NCC | NL | 9th Aug 2011 |
| 77.95.226.0/23 | 512 | RIPE NCC | NL | 9th Aug 2011 |
| 77.95.228.0/24 | 256 | RIPE NCC | NL | 9th Aug 2011 |
| 77.95.230.0/24 | 256 | RIPE NCC | NL | 9th Aug 2011 |
| 77.95.231.0/24 | 256 | RIPE NCC | NL | 9th Aug 2011 |
| 77.95.24.0/21 | 2k | RIPE NCC |  US | 29th May 2007 |
| 78.108.112.0/24 | 256 | RIPE NCC | DE | 23rd Jun 2026 |
| 78.108.113.0/24 | 256 | RIPE NCC |  CZ | 23rd Jun 2026 |
| 78.108.114.0/24 | 256 | RIPE NCC | GB | 23rd Jun 2026 |
| 78.108.116.0/24 | 256 | RIPE NCC | TR | 23rd Jun 2026 |
| 78.108.117.0/24 | 256 | RIPE NCC | PL | 23rd Jun 2026 |
| 78.108.118.0/24 | 256 | RIPE NCC | FI | 23rd Jun 2026 |
| 78.108.119.0/24 | 256 | RIPE NCC | TR | 23rd Jun 2026 |
| 78.108.120.0/24 | 256 | RIPE NCC |  SE | 23rd Jun 2026 |
| 78.108.122.0/24 | 256 | RIPE NCC | RO | 23rd Jun 2026 |
| 78.108.125.0/24 | 256 | RIPE NCC | DK | 26th Jun 2026 |
| 78.108.126.0/24 | 256 | RIPE NCC | RO | 26th Jun 2026 |
| 78.108.127.0/24 | 256 | RIPE NCC | CZ | 26th Jun 2026 |
| 78.108.144.0/21 | 2k | RIPE NCC | CZ | 22nd Jun 2007 |
| 78.110.32.0/23 | 512 | RIPE NCC |  EE | 2nd Aug 2007 |
| 78.110.34.0/24 | 256 | RIPE NCC | EE | 2nd Aug 2007 |
| 78.111.96.0/24 | 256 | RIPE NCC | DE | 10th Sept 2007 |
| 78.128.100.0/22 | 1k | RIPE NCC |  BG | 5th Apr 2007 |