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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 162.254.63.0/24 | 256 | ARIN |  US | 27th Feb 2014 |
| 162.255.128.0/23 | 512 | ARIN | US | 16th May 2014 |
| 162.255.136.0/22 | 1k | ARIN | US | 15th May 2014 |
| 162.255.240.0/22 | 1k | ARIN | US | 27th Jun 2014 |
| 162.255.36.0/22 | 1k | ARIN | US | 9th May 2014 |
| 162.255.68.0/22 | 1k | ARIN | US | 13th May 2014 |
| 162.27.144.0/22 | 1k | ARIN | US | 13th Jul 1992 |
| 162.27.148.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.155.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 162.27.163.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 162.27.164.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 162.27.170.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.176.0/20 | 4.1k | ARIN | US | 13th Jul 1992 |
| 162.27.224.0/21 | 2k | ARIN | US | 13th Jul 1992 |
| 162.27.233.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 162.27.234.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.236.0/22 | 1k | ARIN | US | 13th Jul 1992 |
| 162.27.44.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.46.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 162.27.48.0/21 | 2k | ARIN | US | 13th Jul 1992 |
| 162.27.56.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.58.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.60.0/22 | 1k | ARIN | US | 13th Jul 1992 |
| 162.27.64.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 162.27.70.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.27.72.0/22 | 1k | ARIN | US | 13th Jul 1992 |
| 162.27.76.0/23 | 512 | ARIN | US | 13th Jul 1992 |
| 162.3.0.0/16 | 65.5k | ARIN | US | 12th May 1992 |
| 162.31.0.0/16 | 65.5k | ARIN | US | 13th Jul 1992 |
| 162.35.0.0/18 | 16.4k | ARIN | US | 20th Jul 1992 |
| 162.35.192.0/19 | 8.2k | ARIN | US | 14th Jul 2026 |
| 162.35.64.0/19 | 8.2k | ARIN | US | 20th Jul 1992 |
| 162.37.0.0/16 | 65.5k | ARIN | US | 20th Jul 1992 |
| 162.43.199.0/24 | 256 | ARIN | US | 4th Feb 2021 |
| 162.48.0.0/16 | 65.5k | ARIN | US | 27th Jul 1992 |
| 162.49.0.0/16 | 65.5k | ARIN | US | 28th Jul 1992 |
| 162.54.0.0/17 | 32.8k | ARIN | US | 3rd Aug 1992 |
| 162.54.128.0/17 | 32.8k | ARIN | US | 3rd Aug 1992 |
| 162.63.0.0/16 | 65.5k | ARIN | US | 12th Aug 1992 |
| 162.64.0.0/16 | 65.5k | ARIN | US | 12th Aug 1992 |
| 162.66.0.0/16 | 65.5k | ARIN | US | 12th Aug 1992 |
| 162.7.0.0/16 | 65.5k | ARIN | US | 17th Jun 1992 |
| 162.76.0.0/16 | 65.5k | ARIN | US | 24th Aug 1992 |
| 162.77.0.0/16 | 65.5k | ARIN | US | 24th Aug 1992 |
| 162.89.16.0/22 | 1k | ARIN | US | 17th Sept 1992 |
| 162.89.24.0/21 | 2k | ARIN | US | 17th Sept 1992 |
| 162.89.32.0/19 | 8.2k | ARIN | US | 17th Sept 1992 |
| 162.91.0.0/16 | 65.5k | ARIN | US | 17th Sept 1992 |
| 163.123.176.0/24 | 256 | ARIN | US | 12th Oct 2020 |
| 163.123.177.0/24 | 256 | ARIN | US | 29th Sept 2020 |