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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.186.165.0/24 | 256 | ARIN |  US | 15th Sept 1993 |
| 198.186.166.0/24 | 256 | ARIN | US | 15th Sept 1993 |
| 198.186.168.0/23 | 512 | ARIN | US | 15th Sept 1993 |
| 198.186.173.0/24 | 256 | ARIN | US | 15th Sept 1993 |
| 198.186.174.0/23 | 512 | ARIN | US | 15th Sept 1993 |
| 198.186.176.0/23 | 512 | ARIN | US | 15th Sept 1993 |
| 198.186.178.0/24 | 256 | ARIN | US | 15th Sept 1993 |
| 198.186.179.0/24 | 256 | ARIN | US | 16th Sept 1993 |
| 198.186.180.0/24 | 256 | ARIN | US | 16th Sept 1993 |
| 198.186.181.0/24 | 256 | ARIN | US | 16th Sept 1993 |
| 198.186.183.0/24 | 256 | ARIN | US | 16th Sept 1993 |
| 198.186.184.0/24 | 256 | ARIN | US | 16th Sept 1993 |
| 198.186.185.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.186.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.187.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.188.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.194.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.195.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.196.0/23 | 512 | ARIN | US | 17th Sept 1993 |
| 198.186.198.0/24 | 256 | ARIN | US | 17th Sept 1993 |
| 198.186.199.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.200.0/22 | 1k | ARIN | US | 17th Sept 1993 |
| 198.186.204.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.205.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.206.0/24 | 256 | ARIN | US | 1st May 1995 |
| 198.186.207.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.208.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.209.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.210.0/23 | 512 | ARIN | US | 20th Sept 1993 |
| 198.186.212.0/23 | 512 | ARIN | US | 20th Sept 1993 |
| 198.186.214.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.215.0/24 | 256 | ARIN | US | 20th Sept 1993 |
| 198.186.216.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.217.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.218.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.219.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.223.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.224.0/22 | 1k | ARIN | US | 21st Sept 1993 |
| 198.186.228.0/24 | 256 | ARIN | US | 21st Sept 1993 |
| 198.186.230.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.231.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.232.0/23 | 512 | ARIN | US | 22nd Sept 1993 |
| 198.186.234.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.235.0/24 | 256 | ARIN |  BM | 22nd Sept 1993 |
| 198.186.237.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.243.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.244.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.245.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.254.0/24 | 256 | ARIN | US | 22nd Sept 1993 |
| 198.186.4.0/23 | 512 | ARIN | US | 7th Jun 1993 |