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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,392 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 204.80.197.0/24 | 256 | ARIN |  US | 25th Jan 1995 |
| 204.80.198.0/24 | 256 | ARIN | US | 25th Jan 1995 |
| 204.80.199.0/24 | 256 | ARIN | US | 25th Jan 1995 |
| 204.80.200.0/24 | 256 | ARIN | US | 25th Jan 1995 |
| 204.80.201.0/24 | 256 | ARIN | US | 25th Jan 1995 |
| 204.80.202.0/24 | 256 | ARIN | US | 25th Jan 1995 |
| 204.80.203.0/24 | 256 | ARIN | US | 25th Jan 1995 |
| 204.80.204.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.205.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.206.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.207.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.208.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.209.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.210.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.213.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.214.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.215.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.216.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.217.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.218.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.219.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.220.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.223.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.225.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.227.0/24 | 256 | ARIN | US | 7th Feb 1995 |
| 204.80.229.0/24 | 256 | ARIN | US | 8th Feb 1995 |
| 204.80.230.0/24 | 256 | ARIN | US | 8th Feb 1995 |
| 204.80.231.0/24 | 256 | ARIN | US | 8th Feb 1995 |
| 204.80.232.0/24 | 256 | ARIN | US | 8th Feb 1995 |
| 204.80.233.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 204.80.234.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 204.80.235.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 204.80.236.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 204.80.238.0/24 | 256 | ARIN | US | 9th Feb 1995 |
| 204.80.239.0/24 | 256 | ARIN | US | 10th Feb 1995 |
| 204.80.240.0/24 | 256 | ARIN | US | 16th Feb 1995 |
| 204.80.241.0/24 | 256 | ARIN | US | 16th Feb 1995 |
| 204.80.243.0/24 | 256 | ARIN | US | 16th Feb 1995 |
| 204.80.246.0/24 | 256 | ARIN | US | 16th Feb 1995 |
| 204.80.247.0/24 | 256 | ARIN | US | 17th Feb 1995 |
| 204.80.249.0/24 | 256 | ARIN | US | 17th Feb 1995 |
| 204.80.250.0/23 | 512 | ARIN | US | 17th Feb 1995 |
| 204.80.252.0/22 | 1k | ARIN | US | 17th Feb 1995 |
| 204.80.65.0/24 | 256 | ARIN | US | 13th Oct 1994 |
| 204.80.66.0/23 | 512 | ARIN | US | 13th Oct 1994 |
| 204.80.68.0/22 | 1k | ARIN | US | 13th Oct 1994 |
| 204.80.72.0/21 | 2k | ARIN | US | 13th Oct 1994 |
| 204.80.8.0/21 | 2k | ARIN | US | 27th Jul 1994 |
| 204.80.80.0/22 | 1k | ARIN | US | 13th Oct 1994 |
| 204.80.84.0/23 | 512 | ARIN | US | 13th Oct 1994 |