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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,476 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 204.62.144.0/24 | 256 | ARIN |  US | 3rd Aug 1994 |
| 204.62.146.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 204.62.147.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 204.62.148.0/23 | 512 | ARIN | US | 3rd Aug 1994 |
| 204.62.150.0/23 | 512 | ARIN | US | 2nd Jun 2011 |
| 204.62.152.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 204.62.153.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 204.62.154.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 204.62.156.0/24 | 256 | ARIN | US | 3rd Aug 1994 |
| 204.62.158.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 204.62.161.0/24 | 256 | ARIN | US | 4th Aug 1994 |
| 204.62.162.0/23 | 512 | ARIN | US | 4th Aug 1994 |
| 204.62.164.0/22 | 1k | ARIN | US | 4th Aug 1994 |
| 204.62.168.0/23 | 512 | ARIN | US | 5th Aug 1994 |
| 204.62.170.0/24 | 256 | ARIN | US | 5th Aug 1994 |
| 204.62.171.0/24 | 256 | ARIN | US | 5th Aug 1994 |
| 204.62.172.0/22 | 1k | ARIN | US | 5th Aug 1994 |
| 204.62.176.0/24 | 256 | ARIN | US | 5th Aug 1994 |
| 204.62.177.0/24 | 256 | ARIN | US | 5th Aug 1994 |
| 204.62.178.0/24 | 256 | ARIN | US | 5th Aug 1994 |
| 204.62.179.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.180.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.181.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.182.0/24 | 256 | ARIN | US | 22nd Dec 2022 |
| 204.62.183.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.184.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.186.0/23 | 512 | ARIN | US | 8th Aug 1994 |
| 204.62.188.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.189.0/24 | 256 | ARIN | US | 8th Aug 1994 |
| 204.62.197.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.198.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.208.0/23 | 512 | ARIN | US | 10th Aug 1994 |
| 204.62.210.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.211.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.212.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.214.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.216.0/23 | 512 | ARIN | US | 2nd Jun 2021 |
| 204.62.219.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.220.0/23 | 512 | ARIN | US | 10th Aug 1994 |
| 204.62.222.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.223.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.224.0/22 | 1k | ARIN | US | 10th Aug 1994 |
| 204.62.228.0/23 | 512 | ARIN | US | 10th Aug 1994 |
| 204.62.230.0/24 | 256 | ARIN | US | 10th Aug 1994 |
| 204.62.232.0/24 | 256 | ARIN | US | 11th Aug 1994 |
| 204.62.236.0/22 | 1k | ARIN | US | 12th Aug 1994 |
| 204.62.240.0/23 | 512 | ARIN | US | 12th Aug 1994 |
| 204.62.242.0/24 | 256 | ARIN | US | 12th Aug 1994 |
| 204.62.243.0/24 | 256 | ARIN | US | 12th Aug 1994 |
| 204.62.244.0/24 | 256 | ARIN | US | 12th Aug 1994 |