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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,430 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 65.254.63.0/24 | 256 | ARIN |  US | 26th Nov 2018 |
| 65.255.224.0/20 | 4.1k | ARIN |  CA | 14th Jan 2004 |
| 65.38.116.0/23 | 512 | ARIN | US | 22nd Aug 2003 |
| 65.38.118.0/23 | 512 | ARIN | US | 18th Mar 2024 |
| 65.38.224.0/19 | 8.2k | ARIN | US | 26th Aug 2003 |
| 65.39.204.0/24 | 256 | ARIN | CA | 21st Jun 2002 |
| 65.39.206.0/23 | 512 | ARIN | CA | 21st Jun 2002 |
| 65.49.149.0/24 | 256 | ARIN | US | 27th Nov 2017 |
| 65.61.44.0/23 | 512 | ARIN | US | 5th Jun 2025 |
| 65.61.58.0/24 | 256 | ARIN | CA | 30th Aug 2018 |
| 65.75.128.0/18 | 16.4k | ARIN | US | 16th Jan 2004 |
| 65.87.208.0/23 | 512 | ARIN | US | 17th Feb 2026 |
| 65.87.212.0/22 | 1k | ARIN | US | 30th Jan 2003 |
| 65.87.218.0/23 | 512 | ARIN | US | 30th Jan 2003 |
| 65.97.60.0/22 | 1k | ARIN | US | 19th Dec 2022 |
| 65.98.148.0/23 | 512 | ARIN | US | 13th Feb 2012 |
| 65.98.154.0/24 | 256 | ARIN | US | 13th Feb 2012 |
| 65.98.155.0/24 | 256 | ARIN | US | 13th Feb 2012 |
| 65.98.177.0/24 | 256 | ARIN | US | 13th Feb 2012 |
| 65.98.178.0/23 | 512 | ARIN | US | 13th Feb 2012 |
| 65.98.232.0/21 | 2k | ARIN | US | 13th Feb 2012 |
| 65.98.240.0/24 | 256 | ARIN | US | 13th Feb 2012 |
| 65.98.253.0/24 | 256 | ARIN | US | 13th Feb 2012 |
| 65.98.254.0/23 | 512 | ARIN | US | 13th Feb 2012 |
| 66.1.0.0/16 | 65.5k | ARIN | US | 25th Aug 2000 |
| 66.111.32.0/20 | 4.1k | ARIN | CA | 26th Sept 2018 |
| 66.111.48.0/22 | 1k | ARIN | US | 30th Oct 2018 |
| 66.111.96.0/20 | 4.1k | ARIN | US | 18th Jun 2002 |
| 66.118.32.0/22 | 1k | ARIN | CA | 4th Oct 2021 |
| 66.118.61.0/24 | 256 | ARIN | US | 20th Oct 2021 |
| 66.118.8.0/22 | 1k | ARIN | US | 4th Oct 2021 |
| 66.119.114.0/23 | 512 | ARIN | US | 21st Nov 2017 |
| 66.129.0.0/19 | 8.2k | ARIN | US | 8th Jun 2001 |
| 66.132.135.0/24 | 256 | ARIN | CA | 8th Aug 2003 |
| 66.132.142.0/23 | 512 | ARIN | CA | 1st Aug 2025 |
| 66.132.146.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.149.0/24 | 256 | ARIN | CA | 8th Aug 2003 |
| 66.132.150.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.154.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.156.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.173.0/24 | 256 | ARIN | CA | 8th Aug 2003 |
| 66.132.174.0/24 | 256 | ARIN | CA | 8th Aug 2003 |
| 66.132.180.0/24 | 256 | ARIN | US | 14th May 2024 |
| 66.132.184.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.192.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.196.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.209.0/24 | 256 | ARIN | US | 14th May 2024 |
| 66.132.210.0/23 | 512 | ARIN | CA | 8th Aug 2003 |
| 66.132.233.0/24 | 256 | ARIN | US | 14th May 2024 |
| 66.132.234.0/23 | 512 | ARIN | CA | 8th Aug 2003 |