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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks in United States
27,019 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.65.99.0/24 | 256 | ARIN |  US | 13th Nov 1989 |
| 192.67.105.0/24 | 256 | ARIN | US | 27th Nov 2017 |
| 192.67.106.0/24 | 256 | ARIN | US | 27th Nov 2017 |
| 192.67.107.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.120.0/22 | 1k | ARIN | US | 25th Jan 1990 |
| 192.67.124.0/23 | 512 | ARIN | US | 25th Jan 1990 |
| 192.67.126.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.128.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.129.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.13.0/24 | 256 | ARIN | US | 14th Jul 1993 |
| 192.67.136.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 192.67.14.0/24 | 256 | ARIN | US | 14th Jul 1993 |
| 192.67.144.0/24 | 256 | ARIN | US | 31st Jan 1990 |
| 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 |