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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,315 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.232.196.0/24 | 256 | ARIN |  US | 16th Nov 1993 |
| 198.232.197.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.204.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.205.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.206.0/23 | 512 | ARIN | US | 17th Nov 1993 |
| 198.232.208.0/23 | 512 | ARIN | US | 17th Nov 1993 |
| 198.232.210.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.218.0/23 | 512 | ARIN | US | 10th Sept 2012 |
| 198.232.221.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.224.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.225.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.226.0/23 | 512 | ARIN | US | 18th Nov 1993 |
| 198.232.229.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.230.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.232.0/23 | 512 | ARIN | US | 18th Nov 1993 |
| 198.232.234.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.235.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.240.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.241.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.242.0/24 | 256 | ARIN | US | 19th Nov 2012 |
| 198.232.243.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.244.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.245.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.246.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.248.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.8.0/21 | 2k | ARIN | US | 28th Jul 1993 |
| 198.235.144.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.235.145.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.235.178.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.235.179.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.235.20.0/22 | 1k | ARIN | US | 23rd Jul 2025 |
| 198.235.203.0/24 | 256 | ARIN | US | 6th Apr 2026 |
| 198.235.204.0/23 | 512 | ARIN | US | 12th Oct 2012 |
| 198.235.27.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.235.30.0/24 | 256 | ARIN | US | 30th Sept 1993 |
| 198.235.32.0/20 | 4.1k | ARIN | US | 17th May 1994 |
| 198.240.0.0/21 | 2k | ARIN | US | 2nd Aug 1993 |
| 198.240.16.0/20 | 4.1k | ARIN | US | 31st Aug 1993 |
| 198.240.32.0/19 | 8.2k | ARIN | US | 24th Nov 1993 |
| 198.240.64.0/18 | 16.4k | ARIN | US | 12th Nov 1993 |
| 198.240.8.0/21 | 2k | ARIN | US | 9th Aug 1993 |
| 198.241.10.0/23 | 512 | ARIN | US | 24th Oct 2012 |
| 198.241.32.0/21 | 2k | ARIN | US | 5th Aug 1993 |
| 198.241.40.0/22 | 1k | ARIN | US | 5th Aug 1993 |
| 198.241.48.0/24 | 256 | ARIN | US | 11th Apr 2012 |
| 198.241.50.0/23 | 512 | ARIN | US | 11th Apr 2012 |
| 198.241.52.0/22 | 1k | ARIN | US | 11th Apr 2012 |
| 198.241.56.0/22 | 1k | ARIN | US | 11th Apr 2012 |
| 198.241.63.0/24 | 256 | ARIN | US | 18th Apr 2023 |
| 198.241.64.0/18 | 16.4k | ARIN | US | 15th Jul 1994 |