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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,277 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 162.247.172.0/22 | 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 |
| 162.248.132.0/22 | 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 |
| 162.252.192.0/22 | 1k | ARIN | US | 4th Feb 2014 |
| 162.252.196.0/23 | 512 | ARIN | US | 4th Feb 2014 |
| 162.252.238.0/24 | 256 | ARIN | US | 2nd Mar 2016 |
| 162.252.56.0/22 | 1k | ARIN | US | 27th Jan 2014 |
| 162.253.124.0/22 | 1k | ARIN | US | 14th Feb 2014 |
| 162.253.152.0/22 | 1k | ARIN | US | 18th Feb 2014 |
| 162.253.188.0/22 | 1k | ARIN | US | 10th Jul 2026 |
| 162.253.212.0/22 | 1k | ARIN | US | 28th Sept 2020 |
| 162.253.228.0/22 | 1k | ARIN | US | 21st Feb 2014 |
| 162.254.60.0/23 | 512 | ARIN | US | 27th Feb 2014 |