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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks in United States
26,963 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 162.216.168.0/21 | 2k | ARIN |  US | 3rd Jul 2013 |
| 162.216.20.0/22 | 1k | ARIN | US | 19th Jun 2013 |
| 162.216.224.0/23 | 512 | ARIN | US | 10th Jul 2013 |
| 162.216.98.0/23 | 512 | ARIN | US | 19th Sept 2025 |
| 162.217.16.0/22 | 1k | ARIN | US | 15th Jul 2013 |
| 162.217.160.0/21 | 2k | ARIN | US | 22nd Jul 2013 |
| 162.217.56.0/24 | 256 | ARIN | US | 2nd Apr 2024 |
| 162.217.57.0/24 | 256 | ARIN | US | 2nd May 2024 |
| 162.217.59.0/24 | 256 | ARIN | US | 3rd May 2017 |
| 162.217.8.0/22 | 1k | ARIN | US | 15th Jul 2013 |
| 162.218.104.0/22 | 1k | ARIN | US | 5th Aug 2013 |
| 162.218.108.0/22 | 1k | ARIN | US | 8th Jan 2016 |
| 162.218.159.0/24 | 256 | ARIN | US | 25th Feb 2022 |
| 162.218.96.0/22 | 1k | ARIN | US | 2nd Aug 2013 |
| 162.220.112.0/22 | 1k | ARIN | US | 26th Aug 2013 |
| 162.220.228.0/22 | 1k | ARIN | US | 3rd Sept 2013 |
| 162.221.100.0/22 | 1k | ARIN | US | 17th Sept 2013 |
| 162.221.140.0/22 | 1k | ARIN | US | 19th Sept 2013 |
| 162.221.176.0/23 | 512 | ARIN | US | 29th Nov 2017 |
| 162.221.180.0/24 | 256 | ARIN | US | 6th Feb 2018 |
| 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 | 8th Oct 2026 |
| 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 |
| 162.245.0.0/21 | 2k | ARIN | US | 21st Mar 2014 |
| 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 |
| 162.245.64.0/22 | 1k | ARIN | US | 1st Jun 2018 |
| 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 |