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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.246.132.0/23 | 512 | ARIN |  US | 13th Jul 1994 |
| 198.246.134.0/24 | 256 | ARIN | US | 13th Jul 1994 |
| 198.246.144.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 198.246.146.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 198.246.147.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 198.246.148.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 198.246.156.0/24 | 256 | ARIN | US | 15th Jul 1994 |
| 198.246.157.0/24 | 256 | ARIN | US | 19th Jul 1994 |
| 198.246.158.0/24 | 256 | ARIN | US | 19th Jul 1994 |
| 198.246.16.0/21 | 2k | ARIN | US | 23rd Aug 1993 |
| 198.246.161.0/24 | 256 | ARIN | US | 19th Jul 1994 |
| 198.246.162.0/24 | 256 | ARIN | US | 19th Jul 1994 |
| 198.246.163.0/24 | 256 | ARIN | US | 19th Jul 1994 |
| 198.246.169.0/24 | 256 | ARIN | US | 20th Jul 1994 |
| 198.246.178.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.179.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.180.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.181.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.182.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.183.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.184.0/24 | 256 | ARIN | US | 23rd Jul 1994 |
| 198.246.185.0/24 | 256 | ARIN | US | 26th Jul 1994 |
| 198.246.192.0/24 | 256 | ARIN | US | 26th Jul 1994 |
| 198.246.193.0/24 | 256 | ARIN | US | 26th Jul 1994 |
| 198.246.194.0/24 | 256 | ARIN | US | 26th Jul 1994 |
| 198.246.195.0/24 | 256 | ARIN | US | 26th Jul 1994 |
| 198.246.197.0/24 | 256 | ARIN | US | 26th Jul 1994 |
| 198.246.198.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 198.246.199.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 198.246.201.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 198.246.202.0/24 | 256 | ARIN | US | 27th Jul 1994 |
| 198.246.209.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 198.246.211.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 198.246.212.0/23 | 512 | ARIN | US | 28th Jul 1994 |
| 198.246.214.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 198.246.215.0/24 | 256 | ARIN | US | 28th Jul 1994 |
| 198.246.219.0/24 | 256 | ARIN | US | 2nd Aug 1994 |
| 198.246.221.0/24 | 256 | ARIN | US | 2nd Aug 1994 |
| 198.246.224.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 198.246.225.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 198.246.226.0/23 | 512 | ARIN | US | 3rd Aug 1994 |
| 198.246.228.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 198.246.231.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 198.246.232.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 198.246.234.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 198.246.235.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 198.246.236.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 198.246.237.0/24 | 256 | ARIN | US | 5th Aug 1994 |
| 198.246.24.0/23 | 512 | ARIN | US | 23rd Aug 1993 |
| 198.246.241.0/24 | 256 | ARIN | US | 5th Aug 1994 |