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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 130.12.124.0/24 | 256 | ARIN |  US | 8th Oct 2025 |
| 130.12.127.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.148.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.157.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.158.0/24 | 256 | ARIN | US | 17th Oct 2025 |
| 130.12.174.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.175.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.184.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.189.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.192.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.193.0/24 | 256 | ARIN | US | 14th Oct 2025 |
| 130.12.206.0/24 | 256 | ARIN | US | 8th Dec 2025 |
| 130.12.208.0/24 | 256 | ARIN | US | 9th Oct 2025 |
| 130.12.212.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.220.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.224.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.232.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.236.0/23 | 512 | ARIN | US | 8th Oct 2025 |
| 130.12.239.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.24.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.248.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.252.0/23 | 512 | ARIN | US | 8th Oct 2025 |
| 130.12.28.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.32.0/22 | 1k | ARIN | US | 8th Oct 2025 |
| 130.12.61.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.88.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.90.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.95.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.121.0.0/16 | 65.5k | ARIN | US | 8th Aug 1988 |
| 130.122.0.0/16 | 65.5k | ARIN | US | 8th Aug 1988 |
| 130.128.0.0/16 | 65.5k | ARIN | US | 24th Jul 1991 |
| 130.129.0.0/16 | 65.5k | ARIN | US | 9th Sept 1991 |
| 130.151.0.0/16 | 65.5k | ARIN | US | 18th Aug 1988 |
| 130.168.0.0/16 | 65.5k | ARIN | US | 1st Sept 1988 |
| 130.169.0.0/16 | 65.5k | ARIN | US | 27th Apr 1993 |
| 130.170.0.0/16 | 65.5k | ARIN | US | 27th Apr 1993 |
| 130.172.0.0/16 | 65.5k | ARIN | US | 27th Apr 1993 |
| 130.173.0.0/16 | 65.5k | ARIN | US | 27th Apr 1993 |
| 130.177.0.0/16 | 65.5k | ARIN | US | 22nd Jun 2022 |
| 130.178.0.0/16 | 65.5k | ARIN | US | 27th Apr 1993 |
| 130.196.0.0/16 | 65.5k | ARIN | US | 27th Sept 1988 |
| 130.197.0.0/16 | 65.5k | ARIN | US | 2nd Oct 1988 |
| 130.2.0.0/15 | 131k | ARIN | US | 25th Sept 1992 |
| 130.200.0.0/16 | 65.5k | ARIN | US | 3rd Oct 1988 |
| 130.201.0.0/17 | 32.8k | ARIN | US | 4th Oct 1988 |
| 130.222.0.0/16 | 65.5k | ARIN | US | 21st Oct 1988 |
| 130.224.0.0/16 | 65.5k | ARIN | US | 21st Oct 1988 |
| 130.247.0.0/16 | 65.5k | ARIN | US | 25th Oct 1988 |
| 130.249.0.0/16 | 65.5k | ARIN | US | 27th Oct 1988 |
| 130.250.132.0/24 | 256 | ARIN | US | 17th Feb 2016 |