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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.207.160.0/24 | 256 | ARIN |  US | 3rd Nov 1993 |
| 198.207.161.0/24 | 256 | ARIN | US | 3rd Nov 1993 |
| 198.207.162.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.163.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.166.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.167.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.170.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.175.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.176.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.177.0/24 | 256 | ARIN | US | 4th Nov 1993 |
| 198.207.178.0/24 | 256 | ARIN | US | 5th Nov 1993 |
| 198.207.179.0/24 | 256 | ARIN | US | 5th Nov 1993 |
| 198.207.180.0/24 | 256 | ARIN | US | 5th Nov 1993 |
| 198.207.181.0/24 | 256 | ARIN | US | 5th Nov 1993 |
| 198.207.183.0/24 | 256 | ARIN | US | 5th Nov 1993 |
| 198.207.186.0/24 | 256 | ARIN | US | 5th Nov 1993 |
| 198.207.190.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.191.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.192.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.197.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.198.0/23 | 512 | ARIN | US | 5th Dec 2012 |
| 198.207.205.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.206.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.207.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.208.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.209.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.211.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.212.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.213.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.214.0/23 | 512 | ARIN | US | 8th Nov 1993 |
| 198.207.216.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 198.207.217.0/24 | 256 | ARIN | US | 1st Nov 2012 |
| 198.207.219.0/24 | 256 | ARIN | US | 9th Nov 1993 |
| 198.207.220.0/24 | 256 | ARIN | US | 30th May 1995 |
| 198.207.221.0/24 | 256 | ARIN | US | 5th Nov 2012 |
| 198.207.225.0/24 | 256 | ARIN | US | 9th Nov 1993 |
| 198.207.226.0/24 | 256 | ARIN | US | 16th Nov 2020 |
| 198.207.228.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.229.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.230.0/23 | 512 | ARIN | US | 10th Nov 1993 |
| 198.207.232.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.233.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.234.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.235.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.236.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.242.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.243.0/24 | 256 | ARIN | US | 10th Nov 1993 |
| 198.207.253.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.207.254.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.207.255.0/24 | 256 | ARIN | US | 6th Nov 2012 |