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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.131.82.0/24 | 256 | ARIN |  US | 28th Apr 1992 |
| 192.131.83.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.131.84.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.131.85.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.131.86.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.131.87.0/24 | 256 | ARIN | US | 28th Apr 1992 |
| 192.131.9.0/24 | 256 | ARIN | US | 30th Oct 1991 |
| 192.131.94.0/24 | 256 | ARIN |  CA | 30th Oct 1991 |
| 192.131.95.0/24 | 256 | ARIN | US | 30th Oct 1991 |
| 192.131.98.0/24 | 256 | ARIN | US | 30th Oct 1991 |
| 192.132.100.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.101.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.103.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.105.0/24 | 256 | ARIN | US | 4th May 1992 |
| 192.132.12.0/24 | 256 | ARIN | US | 5th Nov 1991 |
| 192.132.13.0/24 | 256 | ARIN | US | 5th Nov 1991 |
| 192.132.14.0/24 | 256 | ARIN | US | 5th Nov 1991 |
| 192.132.16.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.17.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.18.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.19.0/24 | 256 | ARIN | CA | 29th Mar 1992 |
| 192.132.20.0/24 | 256 | ARIN | US | 6th Nov 1991 |
| 192.132.204.0/24 | 256 | ARIN | US | 4th May 1992 |
| 192.132.207.0/24 | 256 | ARIN | US | 17th Aug 1993 |
| 192.132.21.0/24 | 256 | ARIN | US | 6th Nov 1991 |
| 192.132.210.0/24 | 256 | ARIN | US | 29th Jul 1994 |
| 192.132.211.0/24 | 256 | ARIN | US | 18th Nov 1991 |
| 192.132.213.0/24 | 256 | ARIN | US | 18th Nov 1991 |
| 192.132.214.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.215.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.216.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.22.0/24 | 256 | ARIN | US | 6th Nov 1991 |
| 192.132.220.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.224.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.226.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.23.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.231.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.232.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.233.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.234.0/24 | 256 | ARIN | US | 18th Nov 1991 |
| 192.132.238.0/24 | 256 | ARIN | US | 18th Nov 1991 |
| 192.132.24.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.240.0/24 | 256 | ARIN | US | 20th May 1992 |
| 192.132.241.0/24 | 256 | ARIN | CA | 18th Nov 1991 |
| 192.132.242.0/24 | 256 | ARIN | US | 19th Nov 1991 |
| 192.132.246.0/24 | 256 | ARIN | US | 19th Nov 1991 |
| 192.132.25.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.254.0/24 | 256 | ARIN | US | 20th Nov 1991 |
| 192.132.26.0/24 | 256 | ARIN | US | 7th Nov 1991 |
| 192.132.29.0/24 | 256 | ARIN | US | 7th Nov 1991 |