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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in United States
26,315 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.212.160.0/23 | 512 | ARIN |  US | 2nd Jun 1994 |
| 198.212.167.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.168.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.169.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.170.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.172.0/22 | 1k | ARIN | US | 8th Jun 1994 |
| 198.212.177.0/24 | 256 | ARIN | US | 8th Jun 1994 |
| 198.212.178.0/23 | 512 | ARIN | US | 8th Jun 1994 |
| 198.212.180.0/24 | 256 | ARIN | US | 8th Jun 1994 |
| 198.212.181.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.182.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.189.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.190.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.191.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.198.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.201.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.203.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.204.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.212.0/24 | 256 | ARIN | US | 14th Jun 1994 |
| 198.212.216.0/24 | 256 | ARIN | US | 15th Jun 1994 |
| 198.212.217.0/24 | 256 | ARIN | US | 15th Jun 1994 |
| 198.212.221.0/24 | 256 | ARIN | US | 16th Jun 1994 |
| 198.212.223.0/24 | 256 | ARIN | US | 16th Jun 1994 |
| 198.212.232.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.233.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.234.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.235.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.236.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.240.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.241.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.242.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.243.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.244.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.245.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.246.0/24 | 256 | ARIN | US | 20th Jun 1994 |
| 198.212.248.0/23 | 512 | ARIN | US | 21st Jun 1994 |
| 198.212.250.0/24 | 256 | ARIN | US | 21st Jun 1994 |
| 198.212.252.0/22 | 1k | ARIN | US | 18th May 1994 |
| 198.212.28.0/22 | 1k | ARIN | US | 19th Sept 2012 |
| 198.212.37.0/24 | 256 | ARIN | US | 25th Jan 2024 |
| 198.212.4.0/23 | 512 | ARIN | US | 2nd Jul 1993 |
| 198.212.41.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.212.43.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.212.46.0/23 | 512 | ARIN | US | 22nd Jul 1993 |
| 198.212.6.0/24 | 256 | ARIN | US | 2nd Jul 1993 |
| 198.217.0.0/22 | 1k | ARIN | US | 7th Jul 1993 |
| 198.217.254.0/23 | 512 | ARIN | US | 23rd May 1994 |
| 198.217.4.0/24 | 256 | ARIN | US | 7th Jul 1993 |
| 198.217.5.0/24 | 256 | ARIN | US | 7th Nov 2012 |
| 198.22.0.0/24 | 256 | ARIN | US | 3rd Jul 2013 |