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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 162.120.20.0/24 | 256 | ARIN |  US | 12th Jan 2023 |
| 162.120.40.0/22 | 1k | ARIN | US | 14th Mar 2025 |
| 162.120.44.0/22 | 1k | ARIN | US | 4th Aug 1992 |
| 162.120.48.0/22 | 1k | ARIN | US | 4th Aug 1992 |
| 162.120.72.0/23 | 512 | ARIN | US | 21st Jun 2023 |
| 162.120.80.0/22 | 1k | ARIN | US | 4th Aug 1992 |
| 162.124.0.0/16 | 65.5k | ARIN | US | 20th Nov 1992 |
| 162.142.122.0/24 | 256 | ARIN | US | 23rd Apr 2020 |
| 162.142.78.0/24 | 256 | ARIN | US | 5th Aug 2020 |
| 162.143.0.0/16 | 65.5k | ARIN | US | 11th Jan 1993 |
| 162.16.0.0/16 | 65.5k | ARIN | US | 5th Mar 1992 |
| 162.20.0.0/16 | 65.5k | ARIN | US | 9th Jul 1992 |
| 162.208.120.0/22 | 1k | ARIN | US | 11th Oct 2018 |
| 162.208.124.0/22 | 1k | ARIN | US | 17th Mar 2026 |
| 162.208.20.0/22 | 1k | ARIN | US | 25th Mar 2013 |
| 162.210.120.0/21 | 2k | ARIN | US | 24th Apr 2013 |
| 162.210.208.0/22 | 1k | ARIN | US | 26th Apr 2013 |
| 162.210.212.0/24 | 256 | ARIN | US | 26th Apr 2013 |
| 162.210.214.0/23 | 512 | ARIN | US | 26th Apr 2013 |
| 162.211.64.0/22 | 1k | ARIN | US | 3rd May 2013 |
| 162.212.0.0/22 | 1k | ARIN | US | 13th May 2013 |
| 162.212.192.0/22 | 1k | ARIN | US | 22nd May 2013 |
| 162.212.36.0/22 | 1k | ARIN | US | 21st Feb 2020 |
| 162.213.48.0/21 | 2k | ARIN | US | 14th Jun 2018 |
| 162.213.76.0/22 | 1k | ARIN | US | 4th Jun 2013 |
| 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 |
| 162.216.226.0/23 | 512 | ARIN | US | 28th Oct 2025 |
| 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 |
| 162.218.156.0/24 | 256 | ARIN | US | 1st Feb 2022 |
| 162.218.159.0/24 | 256 | ARIN | US | 25th Feb 2022 |
| 162.218.80.0/22 | 1k | ARIN | US | 12th Jul 2019 |
| 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 |
| 162.221.32.0/23 | 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 |