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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,300 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.67.15.0/24 | 256 | ARIN |  US | 18th Dec 1989 |
| 192.67.152.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.156.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.158.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.160.0/22 | 1k | ARIN | US | 18th Oct 2021 |
| 192.67.165.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.17.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.173.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.174.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.175.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.176.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.177.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.178.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.179.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.18.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.180.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.181.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.182.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.183.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.184.0/24 | 256 | ARIN | US | 8th Feb 1990 |
| 192.67.187.0/24 | 256 | ARIN | US | 8th Feb 1990 |
| 192.67.19.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.2.0/24 | 256 | ARIN | US | 29th Oct 2014 |
| 192.67.21.0/24 | 256 | ARIN | US | 18th Dec 1989 |
| 192.67.219.0/24 | 256 | ARIN | US | 7th Feb 1990 |
| 192.67.22.0/24 | 256 | ARIN | US | 21st Dec 1989 |
| 192.67.224.0/24 | 256 | ARIN | US | 6th Nov 2014 |
| 192.67.24.0/21 | 2k | ARIN | US | 21st Dec 2012 |
| 192.67.240.0/21 | 2k | ARIN | US | 12th Feb 1990 |
| 192.67.252.0/24 | 256 | ARIN | US | 15th Feb 1990 |
| 192.67.254.0/24 | 256 | ARIN | US | 15th Feb 1990 |
| 192.67.41.0/24 | 256 | ARIN | US | 3rd Jan 1990 |
| 192.67.42.0/24 | 256 | ARIN | US | 3rd Jan 1990 |
| 192.67.44.0/24 | 256 | ARIN | US | 3rd Jan 1990 |
| 192.67.46.0/24 | 256 | ARIN | US | 3rd Jan 1990 |
| 192.67.5.0/24 | 256 | ARIN | US | 13th Oct 2014 |
| 192.67.51.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.67.57.0/24 | 256 | ARIN | US | 10th Jan 1990 |
| 192.67.59.0/24 | 256 | ARIN | US | 10th Jan 1990 |
| 192.67.6.0/24 | 256 | ARIN | US | 19th Sept 1989 |
| 192.67.60.0/24 | 256 | ARIN | US | 10th Jan 1990 |
| 192.67.61.0/24 | 256 | ARIN | US | 10th Jan 1990 |
| 192.67.69.0/24 | 256 | ARIN | US | 10th Jan 1990 |
| 192.67.73.0/24 | 256 | ARIN | US | 10th Jan 1990 |
| 192.67.75.0/24 | 256 | ARIN | US | 20th Oct 2014 |
| 192.67.77.0/24 | 256 | ARIN | US | 16th Jan 1990 |
| 192.67.83.0/24 | 256 | ARIN | US | 17th Jan 1990 |
| 192.67.90.0/24 | 256 | ARIN | US | 20th Jan 1990 |
| 192.67.91.0/24 | 256 | ARIN | US | 20th Jan 1990 |
| 192.67.92.0/24 | 256 | ARIN | US | 17th Jan 1990 |