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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.67.57.0/24 | 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 |
| 192.67.95.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.96.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.98.0/24 | 256 | ARIN | US | 25th Jan 1990 |
| 192.67.99.0/24 | 256 | ARIN | US | 24th Jan 1990 |
| 192.68.109.0/24 | 256 | ARIN | US | 21st Feb 1990 |
| 192.68.113.0/24 | 256 | ARIN | US | 21st Feb 1990 |
| 192.68.114.0/24 | 256 | ARIN | US | 21st Feb 1990 |
| 192.68.124.0/23 | 512 | ARIN | US | 21st Feb 1990 |
| 192.68.134.0/24 | 256 | ARIN | US | 7th Mar 1990 |
| 192.68.135.0/24 | 256 | ARIN | US | 7th Mar 1990 |
| 192.68.140.0/24 | 256 | ARIN | US | 7th Mar 1990 |
| 192.68.141.0/24 | 256 | ARIN | US | 9th Mar 1990 |
| 192.68.142.0/24 | 256 | ARIN | US | 9th Mar 1990 |
| 192.68.145.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.146.0/24 | 256 | ARIN | US | 12th Mar 1990 |
| 192.68.147.0/24 | 256 | ARIN | US | 12th Mar 1990 |
| 192.68.155.0/24 | 256 | ARIN | US | 13th Mar 1990 |
| 192.68.159.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.160.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.161.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.162.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.173.0/24 | 256 | ARIN | US | 15th Mar 1990 |
| 192.68.175.0/24 | 256 | ARIN | US | 15th Mar 1990 |
| 192.68.178.0/24 | 256 | ARIN | US | 12th Nov 2014 |
| 192.68.181.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.183.0/24 | 256 | ARIN | US | 16th Mar 1990 |
| 192.68.189.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.191.0/24 | 256 | ARIN | US | 16th May 1989 |
| 192.68.193.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.195.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.198.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.199.0/24 | 256 | ARIN | US | 24th Mar 1990 |
| 192.68.20.0/24 | 256 | ARIN | US | 15th Feb 1990 |
| 192.68.200.0/24 | 256 | ARIN | US | 5th Jun 1990 |
| 192.68.201.0/24 | 256 | ARIN | US | 5th Jun 1990 |
| 192.68.202.0/24 | 256 | ARIN | US | 5th Jun 1990 |
| 192.68.203.0/24 | 256 | ARIN | US | 10th Nov 2014 |