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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 162.252.192.0/22 | 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 |
| 162.254.172.0/22 | 1k | ARIN |  CA | 2nd May 2014 |
| 162.254.40.0/22 | 1k | ARIN | CA | 27th Feb 2014 |
| 162.254.60.0/23 | 512 | ARIN | US | 27th Feb 2014 |
| 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 |
| 162.255.228.0/22 | 1k | ARIN | CA | 27th Jun 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 |