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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,584 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.68.132.0/22 | 1k | LACNIC |  AR | 11th Aug 2026 |
| 45.68.148.0/22 | 1k | LACNIC |  EC | 21st Oct 2026 |
| 45.68.16.0/22 | 1k | LACNIC |  CL | 15th Apr 2021 |
| 45.68.23.0/24 | 256 | LACNIC |  PE | 19th Apr 2023 |
| 45.68.28.0/22 | 1k | LACNIC |  CO | 1st Nov 2022 |
| 45.68.32.0/24 | 256 | LACNIC | CO | 24th Apr 2023 |
| 45.68.64.0/22 | 1k | LACNIC |  MX | 26th Jul 2024 |
| 45.68.68.0/22 | 1k | LACNIC | MX | 16th Jul 2024 |
| 45.68.72.0/22 | 1k | LACNIC |  BR | 25th Jun 2024 |
| 45.68.76.0/22 | 1k | LACNIC | BR | 25th Jun 2024 |
| 45.68.8.0/22 | 1k | LACNIC | AR | 24th Mar 2021 |
| 45.68.80.0/22 | 1k | LACNIC | BR | 25th Jun 2024 |
| 45.68.84.0/22 | 1k | LACNIC | BR | 25th Jun 2024 |
| 45.68.92.0/23 | 512 | LACNIC | BR | 6th Nov 2024 |
| 45.7.124.0/22 | 1k | LACNIC | AR | 19th May 2017 |
| 45.70.152.0/22 | 1k | LACNIC | AR | 1st Sept 2017 |
| 45.74.152.0/22 | 1k | ARIN |  US | 27th May 2026 |
| 45.74.160.0/20 | 4.1k | ARIN | US | 23rd Apr 2015 |
| 45.74.180.0/22 | 1k | ARIN | US | 7th Aug 2026 |
| 45.74.184.0/22 | 1k | ARIN | US | 26th Jun 2026 |
| 45.74.208.0/23 | 512 | ARIN | US | 8th Jul 2026 |
| 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 |
| 45.8.164.0/22 | 1k | RIPE NCC |  DE | 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 |
| 45.80.184.0/22 | 1k | RIPE NCC | DE | 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 |
| 45.80.60.0/22 | 1k | RIPE NCC | DE | 14th May 2019 |
| 45.80.84.0/24 | 256 | RIPE NCC |  IR | 28th Jan 2026 |
| 45.81.100.0/22 | 1k | RIPE NCC |  TR | 17th May 2019 |
| 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 |
| 45.81.41.0/24 | 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 |
| 45.81.50.0/23 | 512 | RIPE NCC | NL | 17th May 2019 |