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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.158.160.0/22 | 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 |
| 45.159.172.0/22 | 1k | RIPE NCC |  NL | 1st Oct 2019 |
| 45.159.216.0/22 | 1k | RIPE NCC | US | 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 |
| 45.160.212.0/23 | 512 | LACNIC |  CL | 14th Aug 2018 |
| 45.160.214.0/24 | 256 | LACNIC | CL | 14th Aug 2018 |
| 45.161.152.0/22 | 1k | LACNIC |  BR | 22nd Aug 2018 |
| 45.162.127.0/24 | 256 | LACNIC | BR | 9th Oct 2018 |
| 45.162.85.0/24 | 256 | LACNIC |  CO | 2nd Oct 2018 |
| 45.163.124.0/22 | 1k | LACNIC |  MX | 10th 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 |
| 45.167.192.0/22 | 1k | LACNIC | CL | 29th 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 |
| 45.171.48.0/23 | 512 | LACNIC | CL | 18th Feb 2019 |
| 45.172.219.0/24 | 256 | LACNIC | AR | 2nd Apr 2019 |
| 45.173.32.0/22 | 1k | LACNIC | BR | 21st Mar 2019 |
| 45.173.47.0/24 | 256 | LACNIC | BR | 21st May 2019 |
| 45.174.104.0/22 | 1k | LACNIC | CL | 3rd 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 |
| 45.177.198.0/24 | 256 | LACNIC | MX | 21st Jun 2019 |
| 45.177.54.0/24 | 256 | LACNIC | CO | 30th May 2019 |
| 45.177.64.0/22 | 1k | LACNIC | AR | 28th May 2019 |
| 45.178.216.0/22 | 1k | LACNIC | BR | 19th Jun 2019 |
| 45.178.32.0/22 | 1k | LACNIC | BR | 4th Jun 2019 |
| 45.178.4.0/22 | 1k | LACNIC | CO | 11th Jun 2019 |
| 45.178.64.0/22 | 1k | LACNIC | CO | 20th Jun 2019 |
| 45.179.199.0/24 | 256 | LACNIC | BR | 1st Jul 2019 |
| 45.180.176.0/23 | 512 | LACNIC | AR | 28th Aug 2019 |
| 45.182.142.0/24 | 256 | LACNIC |  NI | 19th Aug 2019 |
| 45.182.143.0/24 | 256 | LACNIC | AR | 14th Aug 2019 |
| 45.182.188.0/24 | 256 | RIPE NCC |  TR | 19th Sept 2019 |
| 45.182.64.0/22 | 1k | LACNIC | BR | 12th Aug 2019 |
| 45.183.108.0/22 | 1k | LACNIC |  PE | 9th Sept 2019 |