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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,463 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.184.206.0/24 | 256 | ARIN |  US | 23rd Dec 1993 |
| 198.184.207.0/24 | 256 | ARIN | US | 23rd Dec 1993 |
| 198.184.210.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 198.184.211.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 198.184.212.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 198.184.213.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.214.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.215.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.216.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.217.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.218.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.219.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.221.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.222.0/24 | 256 | ARIN | US | 6th Jul 2026 |
| 198.184.223.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.224.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.225.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.226.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.228.0/23 | 512 | ARIN | US | 29th Dec 1993 |
| 198.184.230.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.236.0/22 | 1k | ARIN | US | 29th Dec 1993 |
| 198.184.24.0/23 | 512 | ARIN | US | 18th Jun 1993 |
| 198.184.240.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.241.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.242.0/23 | 512 | ARIN | US | 29th Dec 1993 |
| 198.184.244.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.184.48.0/21 | 2k | ARIN | US | 8th Jul 1993 |
| 198.184.60.0/23 | 512 | ARIN | US | 8th Jul 1993 |
| 198.184.8.0/22 | 1k | ARIN | US | 9th Feb 1994 |
| 198.185.128.0/24 | 256 | ARIN | US | 29th Dec 1993 |
| 198.185.130.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 198.185.131.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 198.185.132.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 198.185.138.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 198.185.139.0/24 | 256 | ARIN | US | 7th May 1996 |
| 198.185.141.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 198.185.142.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 198.185.143.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 198.185.144.0/24 | 256 | ARIN | US | 5th Jan 1994 |
| 198.185.152.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 198.185.153.0/24 | 256 | ARIN | US | 6th Jan 1994 |
| 198.185.155.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 198.185.156.0/23 | 512 | ARIN | US | 11th Jan 1994 |
| 198.185.158.0/24 | 256 | ARIN | US | 11th Jan 1994 |
| 198.185.167.0/24 | 256 | ARIN | US | 13th Jan 1994 |
| 198.185.182.0/24 | 256 | ARIN | US | 13th Jan 1994 |
| 198.185.183.0/24 | 256 | ARIN | US | 13th Jan 1994 |
| 198.185.184.0/24 | 256 | ARIN | US | 13th Jan 1994 |
| 198.185.185.0/24 | 256 | ARIN | US | 13th Jan 1994 |
| 198.185.186.0/24 | 256 | ARIN | US | 13th Jan 1994 |