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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.190.182.0/24 | 256 | ARIN |  US | 3rd Feb 1994 |
| 198.190.183.0/24 | 256 | ARIN | US | 3rd Feb 1994 |
| 198.190.184.0/24 | 256 | ARIN | US | 3rd Feb 1994 |
| 198.190.185.0/24 | 256 | ARIN | US | 3rd Feb 1994 |
| 198.190.188.0/24 | 256 | ARIN | US | 3rd Feb 1994 |
| 198.190.189.0/24 | 256 | ARIN | US | 3rd Feb 1994 |
| 198.190.191.0/24 | 256 | ARIN | US | 3rd Feb 1994 |
| 198.190.192.0/24 | 256 | ARIN | US | 9th Feb 1994 |
| 198.190.193.0/24 | 256 | ARIN | US | 9th Feb 1994 |
| 198.190.196.0/24 | 256 | ARIN | US | 9th Feb 1994 |
| 198.190.199.0/24 | 256 | ARIN | US | 9th Feb 1994 |
| 198.190.200.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 198.190.202.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 198.190.203.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 198.190.204.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 198.190.205.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 198.190.206.0/23 | 512 | ARIN | US | 14th Feb 1994 |
| 198.190.208.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 198.190.209.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 198.190.210.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 198.190.211.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 198.190.215.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 198.190.216.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 198.190.218.0/24 | 256 | ARIN | US | 18th Feb 1994 |
| 198.190.220.0/24 | 256 | ARIN | US | 18th Feb 1994 |
| 198.190.221.0/24 | 256 | ARIN | US | 18th Feb 1994 |
| 198.190.224.0/24 | 256 | ARIN | US | 18th Feb 1994 |
| 198.190.227.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.228.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.232.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.235.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.236.0/22 | 1k | ARIN | US | 22nd Feb 1994 |
| 198.190.240.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.241.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.242.0/23 | 512 | ARIN | US | 22nd Feb 1994 |
| 198.190.244.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 198.190.247.0/24 | 256 | ARIN | US | 13th Aug 2019 |
| 198.190.248.0/24 | 256 | ARIN | US | 24th Feb 1994 |
| 198.190.249.0/24 | 256 | ARIN | US | 24th Feb 1994 |
| 198.190.250.0/23 | 512 | ARIN | US | 24th Feb 1994 |
| 198.190.252.0/24 | 256 | ARIN | US | 24th Feb 1994 |
| 198.190.253.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 198.190.254.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 198.190.30.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.190.31.0/24 | 256 | ARIN | US | 29th Jan 2013 |
| 198.190.8.0/22 | 1k | ARIN | US | 13th Dec 1993 |
| 198.191.0.0/16 | 65.5k | ARIN | US | 17th Jun 1993 |
| 198.192.0.0/16 | 65.5k | ARIN | US | 17th Jun 1993 |
| 198.193.0.0/16 | 65.5k | ARIN | US | 17th Jun 1993 |
| 198.194.0.0/16 | 65.5k | ARIN | US | 17th Jun 1993 |