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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,244 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.147.181.0/24 | 256 | ARIN |  US | 7th Jun 1993 |
| 198.147.182.0/24 | 256 | ARIN | US | 7th Jun 1993 |
| 198.147.183.0/24 | 256 | ARIN | US | 7th Jun 1993 |
| 198.147.184.0/23 | 512 | ARIN | US | 7th Jun 1993 |
| 198.147.186.0/24 | 256 | ARIN | US | 8th Jun 1993 |
| 198.147.187.0/24 | 256 | ARIN | US | 8th Jun 1993 |
| 198.147.188.0/24 | 256 | ARIN | US | 8th Jun 1993 |
| 198.147.189.0/24 | 256 | ARIN | US | 8th Jun 1993 |
| 198.147.196.0/24 | 256 | ARIN | US | 9th Jun 1993 |
| 198.147.197.0/24 | 256 | ARIN | US | 9th Jun 1993 |
| 198.147.199.0/24 | 256 | ARIN | US | 10th Jun 1993 |
| 198.147.200.0/24 | 256 | ARIN | US | 10th Jun 1993 |
| 198.147.201.0/24 | 256 | ARIN | US | 10th Jun 1993 |
| 198.147.203.0/24 | 256 | RIPE NCC |  IN | 10th Jun 1993 |
| 198.147.204.0/24 | 256 | ARIN | US | 10th Jun 1993 |
| 198.147.205.0/24 | 256 | ARIN | US | 10th Jun 1993 |
| 198.147.212.0/23 | 512 | ARIN | US | 7th May 2013 |
| 198.147.214.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.147.215.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.147.216.0/23 | 512 | ARIN | US | 11th Jun 1993 |
| 198.147.218.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.147.220.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.147.222.0/23 | 512 | ARIN | US | 11th Jun 1993 |
| 198.147.224.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.147.225.0/24 | 256 | ARIN | US | 11th Jun 1993 |
| 198.147.227.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.228.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.229.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.230.0/23 | 512 | ARIN | US | 14th Jun 1993 |
| 198.147.232.0/23 | 512 | ARIN | US | 14th Jun 1993 |
| 198.147.234.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.236.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.237.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.238.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.239.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.240.0/23 | 512 | ARIN | US | 14th Jun 1993 |
| 198.147.242.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.244.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.248.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.249.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.147.250.0/23 | 512 | ARIN | US | 15th Jun 1993 |
| 198.147.252.0/23 | 512 | ARIN | US | 15th Jun 1993 |
| 198.147.254.0/24 | 256 | ARIN | US | 15th Jun 1993 |
| 198.147.32.0/19 | 8.2k | ARIN | US | 28th Apr 1993 |
| 198.148.0.0/22 | 1k | ARIN | US | 27th Apr 1993 |
| 198.148.12.0/23 | 512 | ARIN | US | 27th Apr 1993 |
| 198.148.128.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.148.130.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.148.131.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.148.136.0/24 | 256 | ARIN | US | 19th Jul 1993 |