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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,419 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 130.12.32.0/22 | 1k | ARIN |  US | 8th Oct 2025 |
| 130.12.61.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.62.0/24 | 256 | ARIN |  CA | 8th Oct 2025 |
| 130.12.88.0/24 | 256 | ARIN | US | 8th Oct 2025 |
| 130.12.89.0/24 | 256 | ARIN | CA | 13th 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 |
| 130.250.135.0/24 | 256 | ARIN | US | 17th Feb 2016 |
| 130.250.156.0/24 | 256 | ARIN | US | 17th Feb 2016 |
| 130.250.168.0/23 | 512 | ARIN | US | 17th Feb 2016 |
| 130.250.172.0/23 | 512 | ARIN | US | 17th Feb 2016 |
| 130.250.198.0/24 | 256 | ARIN | US | 17th Feb 2016 |
| 130.27.0.0/16 | 65.5k | ARIN | US | 28th Apr 1988 |
| 130.29.0.0/16 | 65.5k | ARIN | US | 28th Apr 1988 |
| 130.30.0.0/16 | 65.5k | ARIN | US | 28th Apr 1988 |
| 130.38.0.0/16 | 65.5k | ARIN | US | 4th May 1988 |
| 130.4.0.0/14 | 262k | ARIN | US | 25th Sept 1992 |
| 130.42.0.0/16 | 65.5k | ARIN | US | 13th Jun 1988 |
| 130.44.25.0/24 | 256 | ARIN | US | 13th May 1988 |
| 130.48.0.0/16 | 65.5k | ARIN | US | 16th May 1988 |
| 130.51.109.0/24 | 256 | ARIN | US | 5th Jun 2024 |
| 130.51.111.0/24 | 256 | ARIN | CA | 2nd Apr 2024 |
| 130.51.16.0/22 | 1k | ARIN | CA | 12th Mar 2021 |
| 130.51.160.0/24 | 256 | ARIN | US | 30th Jan 2020 |
| 130.51.162.0/23 | 512 | ARIN | US | 17th Jan 2020 |
| 130.51.244.0/22 | 1k | ARIN | US | 24th Jan 2020 |
| 130.51.252.0/22 | 1k | ARIN | US | 10th Feb 2020 |
| 130.51.34.0/23 | 512 | ARIN | US | 6th Oct 2025 |