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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.245.160.0/24 | 256 | ARIN |  BB | 27th Jun 1994 |
| 198.245.161.0/24 | 256 | ARIN |  US | 27th Jun 1994 |
| 198.245.162.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.163.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.164.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.165.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.166.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.167.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.168.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.169.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.170.0/23 | 512 | ARIN | US | 28th Jun 1994 |
| 198.245.172.0/24 | 256 | ARIN | US | 28th Jun 1994 |
| 198.245.173.0/24 | 256 | ARIN | US | 20th Nov 2018 |
| 198.245.178.0/24 | 256 | ARIN | US | 13th Jan 2026 |
| 198.245.179.0/24 | 256 | ARIN | US | 29th Jun 1994 |
| 198.245.180.0/24 | 256 | ARIN | US | 29th Jun 1994 |
| 198.245.183.0/24 | 256 | ARIN | US | 29th Jun 1994 |
| 198.245.184.0/23 | 512 | ARIN | US | 1st Jul 1994 |
| 198.245.186.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.191.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.192.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.199.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.200.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.201.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.203.0/24 | 256 | ARIN | US | 1st Jul 1994 |
| 198.245.204.0/24 | 256 | ARIN | US | 2nd Jul 1994 |
| 198.245.205.0/24 | 256 | ARIN | US | 2nd Jul 1994 |
| 198.245.207.0/24 | 256 | ARIN | US | 2nd Jul 1994 |
| 198.245.208.0/24 | 256 | ARIN | US | 2nd Jul 1994 |
| 198.245.213.0/24 | 256 | ARIN | US | 2nd Jul 1994 |
| 198.245.222.0/23 | 512 | ARIN | US | 5th Jul 1994 |
| 198.245.224.0/23 | 512 | ARIN | US | 5th Jul 1994 |
| 198.245.226.0/24 | 256 | ARIN | US | 5th Jul 1994 |
| 198.245.227.0/24 | 256 | ARIN | US | 5th Jul 1994 |
| 198.245.228.0/22 | 1k | ARIN | US | 5th Jul 1994 |
| 198.245.236.0/24 | 256 | ARIN | US | 5th Jul 1994 |
| 198.245.237.0/24 | 256 | ARIN | US | 5th Jul 1994 |
| 198.245.238.0/23 | 512 | ARIN | US | 8th Jul 1994 |
| 198.245.243.0/24 | 256 | ARIN | US | 8th Jul 1994 |
| 198.245.244.0/24 | 256 | ARIN | US | 8th Jul 1994 |
| 198.245.245.0/24 | 256 | ARIN | US | 8th Jul 1994 |
| 198.245.247.0/24 | 256 | ARIN | US | 11th Jul 1994 |
| 198.245.250.0/23 | 512 | ARIN | US | 12th Jul 1994 |
| 198.245.252.0/24 | 256 | ARIN | US | 12th Jul 1994 |
| 198.245.253.0/24 | 256 | ARIN | US | 12th Jul 1994 |
| 198.245.8.0/22 | 1k | ARIN | US | 20th Aug 1993 |
| 198.246.128.0/24 | 256 | ARIN | US | 13th Jul 1994 |
| 198.246.129.0/24 | 256 | ARIN | US | 13th Jul 1994 |
| 198.246.130.0/24 | 256 | ARIN | US | 13th Jul 1994 |
| 198.246.131.0/24 | 256 | ARIN | US | 13th Jul 1994 |