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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,075 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 185.144.148.0/22 | 1k | RIPE NCC |  GB | 24th Mar 2016 |
| 185.144.176.0/22 | 1k | RIPE NCC |  CZ | 29th Mar 2016 |
| 185.144.44.0/22 | 1k | RIPE NCC |  FR | 18th Mar 2016 |
| 185.144.68.0/23 | 512 | ARIN |  US | 19th Sept 2024 |
| 185.145.120.0/22 | 1k | RIPE NCC |  GE | 1st Apr 2016 |
| 185.145.189.0/24 | 256 | RIPE NCC |  NO | 4th Apr 2016 |
| 185.145.190.0/24 | 256 | RIPE NCC |  DE | 4th Apr 2016 |
| 185.145.212.0/22 | 1k | RIPE NCC |  IL | 5th Apr 2016 |
| 185.145.224.0/22 | 1k | RIPE NCC |  ES | 5th Apr 2016 |
| 185.145.234.0/24 | 256 | RIPE NCC | DE | 23rd Jun 2021 |
| 185.145.52.0/24 | 256 | RIPE NCC |  SI | 25th Apr 2022 |
| 185.146.168.0/22 | 1k | RIPE NCC |  RU | 8th Apr 2016 |
| 185.146.200.0/22 | 1k | RIPE NCC | NO | 11th Apr 2016 |
| 185.146.24.0/22 | 1k | RIPE NCC | FR | 6th Apr 2016 |
| 185.146.8.0/22 | 1k | RIPE NCC |  PL | 5th Apr 2016 |
| 185.147.152.0/22 | 1k | RIPE NCC | US | 15th Apr 2016 |
| 185.147.188.0/22 | 1k | RIPE NCC |  CH | 15th Apr 2016 |
| 185.147.240.0/22 | 1k | RIPE NCC | FR | 18th Apr 2016 |
| 185.147.246.0/24 | 256 | RIPE NCC | GB | 18th Apr 2016 |
| 185.147.28.0/22 | 1k | RIPE NCC |  KW | 12th Apr 2016 |
| 185.147.4.0/22 | 1k | RIPE NCC | DE | 12th Apr 2016 |
| 185.147.54.0/24 | 256 | RIPE NCC | DE | 18th Aug 2021 |
| 185.148.136.0/22 | 1k | RIPE NCC | CH | 21st Apr 2016 |
| 185.148.16.0/22 | 1k | RIPE NCC | NO | 18th Apr 2016 |
| 185.148.48.0/22 | 1k | RIPE NCC | US | 19th Apr 2016 |
| 185.148.60.0/22 | 1k | RIPE NCC |  BG | 19th Apr 2016 |
| 185.148.88.0/22 | 1k | RIPE NCC | DE | 20th Apr 2016 |
| 185.149.116.0/22 | 1k | RIPE NCC |  AE | 26th Apr 2016 |
| 185.149.168.0/22 | 1k | RIPE NCC | GE | 28th Apr 2016 |
| 185.149.224.0/22 | 1k | RIPE NCC | DE | 28th Apr 2016 |
| 185.149.236.0/22 | 1k | RIPE NCC | GB | 29th Apr 2016 |
| 185.149.72.0/22 | 1k | RIPE NCC | ES | 26th Apr 2016 |
| 185.149.84.0/22 | 1k | RIPE NCC |  CW | 26th Apr 2016 |
| 185.15.48.0/22 | 1k | RIPE NCC | FR | 10th Jan 2013 |
| 185.15.88.0/22 | 1k | RIPE NCC | RU | 10th Jan 2013 |
| 185.150.108.0/22 | 1k | RIPE NCC |  IR | 2nd May 2016 |
| 185.150.148.0/22 | 1k | RIPE NCC | GB | 3rd May 2016 |
| 185.150.3.0/24 | 256 | RIPE NCC | GB | 29th Apr 2016 |
| 185.151.132.0/22 | 1k | RIPE NCC |  HR | 10th May 2016 |
| 185.151.136.0/22 | 1k | RIPE NCC | GE | 10th May 2016 |
| 185.151.236.0/22 | 1k | RIPE NCC | IR | 13th May 2016 |
| 185.151.76.0/22 | 1k | RIPE NCC |  FI | 9th May 2016 |
| 185.151.88.0/22 | 1k | RIPE NCC |  DK | 9th May 2016 |
| 185.152.152.0/22 | 1k | RIPE NCC | CZ | 19th May 2016 |
| 185.152.156.0/22 | 1k | RIPE NCC |  IT | 19th May 2016 |
| 185.152.192.0/22 | 1k | RIPE NCC |  CA | 19th May 2016 |
| 185.153.233.0/24 | 256 | RIPE NCC | DE | 30th Sept 2020 |
| 185.153.235.0/24 | 256 | RIPE NCC |  IE | 30th Sept 2020 |
| 185.153.72.0/22 | 1k | RIPE NCC | CZ | 23rd May 2016 |
| 185.153.80.0/22 | 1k | RIPE NCC | CZ | 23rd May 2016 |