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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.156.21.0/24 | 256 | RIPE NCC |  RU | 19th Sept 2019 |
| 45.156.22.0/23 | 512 | RIPE NCC | RU | 19th Sept 2019 |
| 45.156.232.0/22 | 1k | RIPE NCC |  FR | 24th Sept 2019 |
| 45.156.24.0/22 | 1k | RIPE NCC | RU | 19th Sept 2019 |
| 45.156.68.0/22 | 1k | RIPE NCC |  ES | 20th Sept 2019 |
| 45.156.80.0/22 | 1k | RIPE NCC |  GB | 20th Sept 2019 |
| 45.157.108.0/22 | 1k | RIPE NCC |  NL | 25th Sept 2019 |
| 45.157.136.0/24 | 256 | RIPE NCC |  SC | 25th Jan 2022 |
| 45.157.172.0/23 | 512 | RIPE NCC |  DE | 26th Sept 2019 |
| 45.157.192.0/22 | 1k | RIPE NCC |  EE | 26th Sept 2019 |
| 45.157.20.0/22 | 1k | RIPE NCC | ES | 24th Sept 2019 |
| 45.157.24.0/22 | 1k | RIPE NCC | NL | 24th Sept 2019 |
| 45.157.252.0/22 | 1k | RIPE NCC | GB | 26th Sept 2019 |
| 45.157.28.0/22 | 1k | RIPE NCC | DE | 24th Sept 2019 |
| 45.157.68.0/22 | 1k | RIPE NCC |  HK | 25th Sept 2019 |
| 45.157.92.0/22 | 1k | RIPE NCC | HK | 25th Sept 2019 |
| 45.158.132.0/22 | 1k | RIPE NCC | DE | 27th Sept 2019 |
| 45.158.156.0/22 | 1k | RIPE NCC |  PS | 27th Sept 2019 |
| 45.158.160.0/22 | 1k | RIPE NCC |  BG | 27th Sept 2019 |
| 45.158.248.0/22 | 1k | RIPE NCC | DE | 30th Sept 2019 |
| 45.158.32.0/22 | 1k | RIPE NCC |  AT | 27th Sept 2019 |
| 45.158.52.0/23 | 512 | RIPE NCC | EE | 27th Sept 2019 |
| 45.158.60.0/22 | 1k | RIPE NCC |  SI | 27th Sept 2019 |
| 45.158.64.0/22 | 1k | RIPE NCC | DE | 27th Sept 2019 |
| 45.159.108.0/24 | 256 | ARIN |  US | 13th Oct 2025 |
| 45.159.132.0/22 | 1k | RIPE NCC | DE | 1st Oct 2019 |
| 45.159.136.0/22 | 1k | RIPE NCC | RU | 1st Oct 2019 |
| 45.159.232.0/22 | 1k | RIPE NCC |  GR | 2nd Oct 2019 |
| 45.159.248.0/22 | 1k | RIPE NCC | RU | 2nd Oct 2019 |
| 45.159.252.0/22 | 1k | RIPE NCC | NL | 2nd Oct 2019 |
| 45.159.66.0/23 | 512 | RIPE NCC |  IT | 1st Oct 2019 |
| 45.160.196.0/22 | 1k | LACNIC |  AR | 17th Aug 2018 |
| 45.161.152.0/22 | 1k | LACNIC |  BR | 22nd Aug 2018 |
| 45.161.210.0/23 | 512 | LACNIC | BR | 28th Aug 2018 |
| 45.162.127.0/24 | 256 | LACNIC | BR | 9th Oct 2018 |
| 45.162.85.0/24 | 256 | LACNIC |  CO | 2nd Oct 2018 |
| 45.163.128.0/22 | 1k | LACNIC | AR | 5th Oct 2018 |
| 45.163.20.0/22 | 1k | LACNIC | AR | 27th Sept 2018 |
| 45.164.206.0/24 | 256 | LACNIC | BR | 24th Mar 2023 |
| 45.165.36.0/22 | 1k | LACNIC | AR | 29th Oct 2018 |
| 45.166.120.0/22 | 1k | LACNIC | BR | 13th Nov 2018 |
| 45.168.104.0/22 | 1k | LACNIC | CO | 12th Dec 2018 |
| 45.168.81.0/24 | 256 | LACNIC | BR | 3rd Dec 2018 |
| 45.169.182.0/23 | 512 | LACNIC | BR | 21st Jan 2019 |
| 45.169.236.0/22 | 1k | LACNIC |  MX | 17th Jan 2019 |
| 45.170.136.0/24 | 256 | LACNIC | BR | 28th Jan 2019 |
| 45.172.219.0/24 | 256 | LACNIC | AR | 2nd Apr 2019 |
| 45.174.16.0/22 | 1k | LACNIC | BR | 18th Apr 2019 |
| 45.174.224.0/23 | 512 | LACNIC | CO | 26th Apr 2019 |
| 45.175.240.0/22 | 1k | LACNIC | BR | 13th May 2019 |