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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.74.212.0/23 | 512 | ARIN |  US | 13th Mar 2026 |
| 45.74.224.0/20 | 4.1k | RIPE NCC | US | 23rd Apr 2015 |
| 45.74.254.0/23 | 512 | ARIN | US | 27th Feb 2026 |
| 45.8.104.0/24 | 256 | RIPE NCC |  NO | 8th Jan 2025 |
| 45.8.105.0/24 | 256 | RIPE NCC |  FR | 8th Jan 2025 |
| 45.8.106.0/24 | 256 | RIPE NCC |  HR | 8th Jan 2025 |
| 45.8.107.0/24 | 256 | RIPE NCC |  RU | 8th Jan 2025 |
| 45.8.144.0/22 | 1k | RIPE NCC | RU | 15th Apr 2019 |
| 45.8.212.0/22 | 1k | RIPE NCC |  HU | 16th Apr 2019 |
| 45.8.60.0/22 | 1k | RIPE NCC |  AT | 12th Apr 2019 |
| 45.8.8.0/22 | 1k | RIPE NCC | NO | 12th Apr 2019 |
| 45.80.109.0/24 | 256 | RIPE NCC |  DE | 15th May 2019 |
| 45.80.16.0/22 | 1k | RIPE NCC |  CH | 14th May 2019 |
| 45.80.175.0/24 | 256 | RIPE NCC |  LI | 15th May 2019 |
| 45.80.176.0/22 | 1k | RIPE NCC | AT | 15th May 2019 |
| 45.80.216.0/22 | 1k | RIPE NCC | RU | 16th May 2019 |
| 45.80.56.0/22 | 1k | RIPE NCC |  SE | 14th May 2019 |
| 45.80.84.0/24 | 256 | RIPE NCC |  IR | 28th Jan 2026 |
| 45.81.140.0/22 | 1k | RIPE NCC |  TR | 20th May 2019 |
| 45.81.176.0/22 | 1k | RIPE NCC |  BG | 21st May 2019 |
| 45.81.184.0/22 | 1k | RIPE NCC |  NL | 21st May 2019 |
| 45.81.236.0/22 | 1k | RIPE NCC | AT | 21st May 2019 |
| 45.81.244.0/22 | 1k | RIPE NCC | AT | 21st May 2019 |
| 45.81.4.0/22 | 1k | RIPE NCC | DE | 16th May 2019 |
| 45.81.41.0/24 | 256 | RIPE NCC |  SK | 17th May 2019 |
| 45.81.42.0/23 | 512 | RIPE NCC |  CZ | 17th May 2019 |
| 45.81.48.0/23 | 512 | RIPE NCC | NL | 17th May 2019 |
| 45.81.8.0/22 | 1k | RIPE NCC | AT | 16th May 2019 |
| 45.82.116.0/22 | 1k | RIPE NCC |  HK | 23rd May 2019 |
| 45.82.12.0/24 | 256 | RIPE NCC | RU | 21st May 2019 |
| 45.82.20.0/22 | 1k | RIPE NCC | DE | 22nd May 2019 |
| 45.82.204.0/22 | 1k | RIPE NCC | AT | 24th May 2019 |
| 45.82.208.0/22 | 1k | RIPE NCC | FR | 24th May 2019 |
| 45.82.24.0/22 | 1k | RIPE NCC | DE | 22nd May 2019 |
| 45.82.248.0/22 | 1k | RIPE NCC |  CY | 27th May 2019 |
| 45.82.36.0/22 | 1k | RIPE NCC | CH | 22nd May 2019 |
| 45.82.57.0/24 | 256 | RIPE NCC | NL | 22nd May 2019 |
| 45.82.58.0/23 | 512 | RIPE NCC | NL | 22nd May 2019 |
| 45.83.112.0/22 | 1k | RIPE NCC | CZ | 27th May 2019 |
| 45.83.128.0/22 | 1k | RIPE NCC | CY | 27th May 2019 |
| 45.83.140.0/22 | 1k | RIPE NCC | CY | 27th May 2019 |
| 45.83.148.0/22 | 1k | RIPE NCC | CY | 27th May 2019 |
| 45.83.196.0/22 | 1k | RIPE NCC | DE | 28th May 2019 |
| 45.83.200.0/22 | 1k | RIPE NCC | NL | 28th May 2019 |
| 45.83.208.0/22 | 1k | RIPE NCC | NL | 28th May 2019 |
| 45.83.24.0/22 | 1k | RIPE NCC | CY | 27th May 2019 |
| 45.83.252.0/22 | 1k | RIPE NCC | AT | 28th May 2019 |
| 45.83.52.0/22 | 1k | RIPE NCC |  EE | 27th May 2019 |
| 45.83.80.0/22 | 1k | RIPE NCC |  ES | 27th May 2019 |
| 45.83.84.0/22 | 1k | RIPE NCC | CY | 27th May 2019 |