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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 185.166.95.0/24 | 256 | RIPE NCC |  DK | 22nd Jan 2026 |
| 185.167.100.0/22 | 1k | RIPE NCC |  IR | 12th Sept 2016 |
| 185.167.156.0/22 | 1k | RIPE NCC |  DE | 13th Sept 2016 |
| 185.167.168.0/22 | 1k | RIPE NCC |  GB | 13th Sept 2016 |
| 185.167.180.0/24 | 256 | RIPE NCC |  IE | 17th Apr 2020 |
| 185.167.182.0/24 | 256 | ARIN |  US | 9th Jun 2022 |
| 185.167.248.0/22 | 1k | RIPE NCC |  FR | 14th Sept 2016 |
| 185.167.254.0/24 | 256 | RIPE NCC | GB | 29th Apr 2020 |
| 185.167.255.0/24 | 256 | RIPE NCC |  NL | 29th Apr 2020 |
| 185.167.64.0/22 | 1k | RIPE NCC |  CZ | 9th Sept 2016 |
| 185.167.68.0/22 | 1k | RIPE NCC | CZ | 9th Sept 2016 |
| 185.167.80.0/22 | 1k | RIPE NCC |  CH | 9th Sept 2016 |
| 185.168.10.0/24 | 256 | RIPE NCC | GB | 14th Sept 2016 |
| 185.168.136.0/22 | 1k | RIPE NCC | GB | 19th Sept 2016 |
| 185.168.148.0/24 | 256 | RIPE NCC | DE | 29th Mar 2022 |
| 185.168.64.0/22 | 1k | RIPE NCC |  LT | 15th Sept 2016 |
| 185.169.106.0/24 | 256 | RIPE NCC | CH | 12th Jan 2024 |
| 185.169.12.0/22 | 1k | RIPE NCC | DK | 21st Sept 2016 |
| 185.169.120.0/22 | 1k | RIPE NCC | GB | 23rd Sept 2016 |
| 185.169.128.0/22 | 1k | RIPE NCC | DE | 23rd Sept 2016 |
| 185.169.16.0/22 | 1k | RIPE NCC |  ES | 21st Sept 2016 |
| 185.169.168.0/22 | 1k | RIPE NCC | GB | 26th Sept 2016 |
| 185.169.212.0/22 | 1k | RIPE NCC | DE | 27th Sept 2016 |
| 185.169.216.0/22 | 1k | RIPE NCC |  RU | 27th Sept 2016 |
| 185.169.40.0/22 | 1k | RIPE NCC |  SE | 21st Sept 2016 |
| 185.169.48.0/22 | 1k | RIPE NCC |  SA | 22nd Sept 2016 |
| 185.17.220.0/22 | 1k | RIPE NCC |  VA | 1st Feb 2013 |
| 185.17.248.0/22 | 1k | RIPE NCC | FR | 4th Feb 2013 |
| 185.170.100.0/22 | 1k | RIPE NCC | GB | 29th Sept 2016 |
| 185.170.12.0/22 | 1k | RIPE NCC | FR | 27th Sept 2016 |
| 185.170.147.0/24 | 256 | RIPE NCC | ES | 13th Jan 2020 |
| 185.170.148.0/22 | 1k | RIPE NCC | FR | 30th Sept 2016 |
| 185.170.152.0/24 | 256 | RIPE NCC | GB | 30th Sept 2016 |
| 185.170.160.0/22 | 1k | RIPE NCC | DE | 30th Sept 2016 |
| 185.170.168.0/22 | 1k | RIPE NCC | DE | 30th Sept 2016 |
| 185.170.240.0/22 | 1k | RIPE NCC | CZ | 3rd Oct 2016 |
| 185.170.68.0/22 | 1k | RIPE NCC | NL | 28th Sept 2016 |
| 185.171.0.0/22 | 1k | RIPE NCC |  AT | 4th Oct 2016 |
| 185.171.152.0/22 | 1k | RIPE NCC | SA | 6th Oct 2016 |
| 185.171.163.0/24 | 256 | RIPE NCC | NL | 4th Jul 2023 |
| 185.171.188.0/22 | 1k | RIPE NCC | GB | 6th Oct 2016 |
| 185.171.201.0/24 | 256 | RIPE NCC | GB | 6th Aug 2020 |
| 185.171.236.0/22 | 1k | RIPE NCC | NL | 7th Oct 2016 |
| 185.171.40.0/22 | 1k | RIPE NCC | NL | 4th Oct 2016 |
| 185.171.89.0/24 | 256 | RIPE NCC | NL | 5th Oct 2016 |
| 185.171.90.0/24 | 256 | RIPE NCC | NL | 5th Oct 2016 |
| 185.172.144.0/22 | 1k | RIPE NCC | AT | 12th Oct 2016 |
| 185.172.192.0/22 | 1k | RIPE NCC | DE | 13th Oct 2016 |
| 185.172.232.0/22 | 1k | RIPE NCC | FR | 13th Oct 2016 |
| 185.172.244.0/22 | 1k | RIPE NCC | GB | 13th Oct 2016 |