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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,434 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 162.221.140.0/22 | 1k | ARIN |  US | 19th Sept 2013 |
| 162.221.176.0/23 | 512 | ARIN | US | 29th Nov 2017 |
| 162.221.32.0/23 | 512 | ARIN | US | 3rd Oct 2024 |
| 162.221.64.0/21 | 2k | ARIN | US | 28th Sept 2018 |
| 162.222.104.0/22 | 1k | ARIN | US | 19th Dec 2022 |
| 162.222.112.0/22 | 1k | ARIN | US | 2nd Oct 2013 |
| 162.222.228.0/22 | 1k | ARIN | US | 10th Oct 2013 |
| 162.222.64.0/22 | 1k | ARIN | US | 27th Sept 2013 |
| 162.222.68.0/22 | 1k | ARIN | US | 29th Sept 2020 |
| 162.222.96.0/22 | 1k | ARIN | US | 1st Oct 2013 |
| 162.223.136.0/21 | 2k | ARIN | US | 23rd Oct 2013 |
| 162.223.184.0/21 | 2k | ARIN | US | 25th Oct 2013 |
| 162.223.248.0/22 | 1k | ARIN | US | 1st Nov 2013 |
| 162.223.40.0/22 | 1k | ARIN | US | 17th Oct 2013 |
| 162.244.104.0/21 | 2k | ARIN | US | 11th Mar 2014 |
| 162.244.184.0/21 | 2k | ARIN | US | 17th Mar 2014 |
| 162.244.20.0/22 | 1k | ARIN | US | 12th Jul 2018 |
| 162.245.0.0/21 | 2k | ARIN | US | 21st Mar 2014 |
| 162.245.100.0/22 | 1k | ARIN | US | 4th Oct 2021 |
| 162.245.116.0/22 | 1k | ARIN | US | 2nd Mar 2018 |
| 162.245.224.0/22 | 1k | ARIN | US | 1st Apr 2014 |
| 162.245.52.0/23 | 512 | ARIN | US | 24th Mar 2014 |
| 162.246.164.0/22 | 1k | ARIN | US | 11th Apr 2014 |
| 162.246.188.0/22 | 1k | ARIN | US | 14th Apr 2014 |
| 162.246.220.0/22 | 1k | ARIN | US | 14th Apr 2014 |
| 162.246.234.0/23 | 512 | ARIN | US | 14th Aug 2020 |
| 162.246.80.0/22 | 1k | ARIN | US | 7th Apr 2014 |
| 162.246.96.0/22 | 1k | ARIN | US | 28th Oct 2019 |
| 162.247.108.0/22 | 1k | ARIN | US | 21st Apr 2014 |
| 162.247.168.0/22 | 1k | ARIN |  CA | 24th Apr 2014 |
| 162.247.172.0/22 | 1k | ARIN | US | 24th Apr 2014 |
| 162.247.184.0/22 | 1k | ARIN | US | 24th Apr 2014 |
| 162.247.196.0/22 | 1k | ARIN | US | 1st Jul 2026 |
| 162.247.48.0/22 | 1k | ARIN | US | 17th Apr 2014 |
| 162.248.120.0/21 | 2k | ARIN | CA | 12th Nov 2013 |
| 162.248.132.0/22 | 1k | ARIN | US | 14th Nov 2013 |
| 162.248.4.0/22 | 1k | ARIN | US | 1st Nov 2013 |
| 162.249.116.0/23 | 512 | ARIN | US | 23rd Oct 2019 |
| 162.249.196.0/22 | 1k | ARIN | US | 16th Apr 2019 |
| 162.249.20.0/22 | 1k | ARIN | US | 26th Nov 2013 |
| 162.249.208.0/21 | 2k | ARIN | US | 5th Dec 2013 |
| 162.249.227.0/24 | 256 | ARIN | US | 24th Feb 2025 |
| 162.249.45.0/24 | 256 | ARIN | US | 22nd Apr 2016 |
| 162.249.84.0/22 | 1k | ARIN | US | 2nd Dec 2013 |
| 162.250.112.0/22 | 1k | ARIN | US | 26th Jun 2025 |
| 162.250.248.0/21 | 2k | ARIN | US | 31st Dec 2013 |
| 162.250.48.0/21 | 2k | ARIN | US | 13th Dec 2013 |
| 162.251.152.0/22 | 1k | ARIN | US | 8th Jan 2014 |
| 162.251.48.0/21 | 2k | ARIN | US | 3rd Jan 2014 |
| 162.251.86.0/24 | 256 | ARIN | US | 6th Jan 2014 |