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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,285 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.165.191.0/24 | 256 | ARIN |  US | 28th Mar 1994 |
| 199.165.192.0/24 | 256 | ARIN | US | 28th Mar 1994 |
| 199.165.194.0/24 | 256 | ARIN | US | 28th Mar 1994 |
| 199.165.195.0/24 | 256 | ARIN | US | 28th Mar 1994 |
| 199.165.196.0/24 | 256 | ARIN | US | 28th Mar 1994 |
| 199.165.197.0/24 | 256 | ARIN | US | 21st Jan 1997 |
| 199.165.207.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 199.165.208.0/22 | 1k | ARIN | US | 29th Mar 1994 |
| 199.165.213.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 199.165.214.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 199.165.215.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 199.165.216.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 199.165.217.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 199.165.218.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 199.165.220.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 199.165.221.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 199.165.222.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 199.165.224.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 199.165.225.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 199.165.226.0/23 | 512 | ARIN | US | 1st Apr 1994 |
| 199.165.228.0/23 | 512 | ARIN | US | 1st Apr 1994 |
| 199.165.230.0/24 | 256 | ARIN | US | 4th Apr 1994 |
| 199.165.231.0/24 | 256 | ARIN | US | 4th Apr 1994 |
| 199.165.232.0/24 | 256 | ARIN | US | 4th Apr 1994 |
| 199.165.234.0/24 | 256 | ARIN | US | 5th Apr 1994 |
| 199.165.235.0/24 | 256 | ARIN | US | 5th Apr 1994 |
| 199.165.236.0/24 | 256 | ARIN | US | 5th Apr 1994 |
| 199.165.237.0/24 | 256 | ARIN | US | 5th Apr 1994 |
| 199.165.239.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 199.165.240.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 199.165.241.0/24 | 256 | ARIN | US | 13th Apr 1994 |
| 199.165.242.0/24 | 256 | ARIN | US | 13th Apr 1994 |
| 199.165.243.0/24 | 256 | ARIN | US | 13th Apr 1994 |
| 199.165.244.0/24 | 256 | ARIN | US | 13th Apr 1994 |
| 199.165.245.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.247.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.248.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.249.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.250.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.251.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.252.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.253.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.254.0/24 | 256 | ARIN | US | 14th Apr 1994 |
| 199.165.32.0/19 | 8.2k | ARIN | US | 29th Apr 1994 |
| 199.165.8.0/22 | 1k | ARIN | US | 2nd Feb 1994 |
| 199.166.0.0/24 | 256 | ARIN | US | 17th Sept 2012 |
| 199.166.1.0/24 | 256 | ARIN |  CA | 13th May 1994 |
| 199.166.160.0/20 | 4.1k | ARIN | CA | 2nd Feb 1994 |
| 199.166.176.0/21 | 2k | ARIN | CA | 2nd Feb 1994 |
| 199.166.190.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |