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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,422 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 131.98.0.0/16 | 65.5k | ARIN |  US | 2nd Nov 1988 |
| 132.152.0.0/16 | 65.5k | ARIN | US | 17th Feb 1989 |
| 132.158.0.0/16 | 65.5k | ARIN | US | 22nd Feb 1989 |
| 132.173.0.0/16 | 65.5k | ARIN | US | 28th Feb 1989 |
| 132.192.0.0/16 | 65.5k | ARIN | US | 24th Oct 2024 |
| 132.201.0.0/16 | 65.5k | ARIN | US | 14th Mar 1989 |
| 132.202.0.0/16 | 65.5k | ARIN |  CA | 31st May 1989 |
| 132.224.0.0/16 | 65.5k | ARIN | US | 17th Mar 1989 |
| 132.233.0.0/16 | 65.5k | ARIN | US | 23rd Mar 1989 |
| 132.237.0.0/17 | 32.8k | ARIN | US | 24th Mar 1989 |
| 132.240.0.0/16 | 65.5k | ARIN | US | 27th Mar 1989 |
| 132.243.32.0/19 | 8.2k | ARIN | US | 29th Mar 1989 |
| 132.253.0.0/16 | 65.5k | ARIN | US | 5th Apr 1989 |
| 134.116.0.0/16 | 65.5k | ARIN | US | 25th May 1989 |
| 134.120.0.0/16 | 65.5k | ARIN | US | 5th May 1989 |
| 134.123.0.0/16 | 65.5k | ARIN | US | 31st May 1989 |
| 134.128.32.0/19 | 8.2k | ARIN | US | 20th Mar 2014 |
| 134.13.0.0/16 | 65.5k | ARIN | US | 18th Jul 2018 |
| 134.133.0.0/16 | 65.5k | ARIN | US | 8th Jun 1989 |
| 134.14.0.0/15 | 131k | ARIN | US | 12th Apr 1989 |
| 134.177.0.0/16 | 65.5k | ARIN | US | 2nd Aug 2011 |
| 134.189.0.0/16 | 65.5k | ARIN | US | 10th Jul 1989 |
| 134.195.103.0/24 | 256 | ARIN | US | 25th Aug 2020 |
| 134.195.108.0/22 | 1k | ARIN | US | 25th Jun 2020 |
| 134.195.120.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.195.122.0/24 | 256 | ARIN | US | 26th Jun 2020 |
| 134.195.123.0/24 | 256 | ARIN | US | 7th Jul 2020 |
| 134.195.151.0/24 | 256 | ARIN | CA | 20th Oct 2025 |
| 134.195.16.0/23 | 512 | ARIN | US | 11th Aug 2020 |
| 134.195.164.0/22 | 1k | ARIN | CA | 10th Jul 2020 |
| 134.195.168.0/24 | 256 | ARIN | CA | 14th Jul 2020 |
| 134.195.18.0/24 | 256 | ARIN | US | 16th Jul 2020 |
| 134.195.180.0/23 | 512 | ARIN | US | 29th Jun 2020 |
| 134.195.188.0/22 | 1k | ARIN | CA | 30th Sept 2025 |
| 134.195.193.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.195.204.0/24 | 256 | ARIN | US | 13th Jul 2020 |
| 134.195.205.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.195.212.0/22 | 1k | ARIN | US | 24th Sept 2025 |
| 134.195.244.0/24 | 256 | ARIN | US | 1st Jul 2020 |
| 134.195.253.0/24 | 256 | ARIN | US | 26th Jun 2020 |
| 134.195.70.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 134.199.36.0/23 | 512 | ARIN | CA | 13th Jul 1989 |
| 134.199.45.0/24 | 256 | ARIN | CA | 13th Jul 1989 |
| 134.200.0.0/16 | 65.5k | ARIN | US | 17th Jul 1989 |
| 134.218.0.0/16 | 65.5k | ARIN | US | 25th Jul 1989 |
| 134.23.0.0/16 | 65.5k | ARIN | US | 9th Dec 2022 |
| 134.232.0.0/16 | 65.5k | ARIN | US | 7th Aug 1989 |
| 134.242.0.0/20 | 4.1k | ARIN | US | 15th Aug 1989 |
| 134.242.120.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.124.0/23 | 512 | ARIN | US | 15th Aug 1989 |