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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 76.188.0.0/15 | 131k | ARIN |  US | 26th Jul 2006 |
| 76.191.0.0/20 | 4.1k | ARIN | US | 12th Dec 2007 |
| 76.75.192.0/20 | 4.1k | ARIN | US | 21st May 2024 |
| 76.75.208.0/20 | 4.1k | ARIN | US | 3rd May 2007 |
| 76.76.11.0/24 | 256 | ARIN | US | 6th Oct 2020 |
| 76.76.24.0/24 | 256 | ARIN | US | 9th Feb 2021 |
| 76.76.5.0/24 | 256 | ARIN | US | 4th Nov 2020 |
| 76.76.9.0/24 | 256 | ARIN | US | 22nd Feb 2019 |
| 76.76.96.0/19 | 8.2k | ARIN |  CA | 2nd May 2007 |
| 77.232.64.0/19 | 8.2k | RIPE NCC |  SE | 12th Dec 2006 |
| 77.233.128.0/19 | 8.2k | RIPE NCC |  GB | 19th Dec 2006 |
| 77.236.100.0/22 | 1k | RIPE NCC |  FR | 29th Jan 2007 |
| 77.236.120.0/21 | 2k | RIPE NCC |  SA | 29th Jan 2007 |
| 77.241.72.0/22 | 1k | RIPE NCC |  TR | 4th Oct 2018 |
| 77.243.156.0/22 | 1k | RIPE NCC | SE | 14th Mar 2007 |
| 77.243.192.0/20 | 4.1k | RIPE NCC |  ES | 16th Mar 2007 |
| 77.243.240.0/20 | 4.1k | RIPE NCC |  RU | 20th Mar 2007 |
| 77.243.92.0/22 | 1k | RIPE NCC |  AT | 9th Aug 2018 |
| 77.244.160.0/20 | 4.1k | RIPE NCC | RU | 3rd Apr 2007 |
| 77.246.240.0/24 | 256 | RIPE NCC |  CY | 11th Aug 2021 |
| 77.247.108.0/23 | 512 | RIPE NCC |  EE | 3rd Oct 2018 |
| 77.247.112.0/22 | 1k | RIPE NCC |  RO | 3rd Oct 2018 |
| 77.247.194.0/24 | 256 | RIPE NCC | RO | 8th Mar 2023 |
| 77.72.152.0/21 | 2k | RIPE NCC |  NL | 14th Feb 2007 |
| 77.72.200.0/21 | 2k | RIPE NCC | GB | 19th Feb 2007 |
| 77.72.24.0/21 | 2k | RIPE NCC | ES | 17th Jan 2007 |
| 77.72.8.0/21 | 2k | RIPE NCC |  DE | 16th Jan 2007 |
| 77.73.115.0/24 | 256 | RIPE NCC |  RS | 19th Jan 2026 |
| 77.73.116.0/24 | 256 | RIPE NCC | FR | 19th Jan 2026 |
| 77.73.118.0/24 | 256 | RIPE NCC | ES | 19th Jan 2026 |
| 77.73.20.0/22 | 1k | RIPE NCC | DE | 18th Jun 2018 |
| 77.73.233.0/24 | 256 | RIPE NCC | RU | 30th Mar 2007 |
| 77.73.235.0/24 | 256 | RIPE NCC | RU | 30th Mar 2007 |
| 77.73.238.0/24 | 256 | RIPE NCC | RU | 30th Mar 2007 |
| 77.73.239.0/24 | 256 | RIPE NCC | RU | 30th Mar 2007 |
| 77.73.72.0/21 | 2k | RIPE NCC | GB | 8th Mar 2007 |
| 77.75.225.0/24 | 256 | RIPE NCC | DE | 10th Aug 2021 |
| 77.75.230.0/24 | 256 | RIPE NCC |  MD | 10th Aug 2021 |
| 77.75.52.0/22 | 1k | RIPE NCC | DE | 9th Aug 2018 |
| 77.78.120.0/23 | 512 | RIPE NCC | DE | 27th Feb 2007 |
| 77.78.144.0/24 | 256 | RIPE NCC |  BG | 5th Mar 2007 |
| 77.78.145.0/24 | 256 | RIPE NCC | BG | 5th Mar 2007 |
| 77.78.146.0/23 | 512 | RIPE NCC | BG | 5th Mar 2007 |
| 77.78.151.0/24 | 256 | RIPE NCC | BG | 5th Mar 2007 |
| 77.78.70.0/23 | 512 | RIPE NCC | DE | 27th Feb 2007 |
| 77.78.72.0/23 | 512 | RIPE NCC | DE | 27th Feb 2007 |
| 77.81.140.0/24 | 256 | RIPE NCC | RO | 15th Feb 2007 |
| 77.81.176.0/24 | 256 | RIPE NCC |  IQ | 15th Feb 2007 |
| 77.81.182.0/24 | 256 | RIPE NCC |  AE | 15th Feb 2007 |
| 77.81.248.0/21 | 2k | RIPE NCC |  AZ | 15th Feb 2007 |