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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 69.87.8.0/21 | 2k | ARIN |  US | 11th Aug 2023 |
| 69.88.132.0/23 | 512 | ARIN | US | 20th Nov 2003 |
| 69.88.136.0/21 | 2k | ARIN | US | 20th Nov 2003 |
| 69.88.148.0/22 | 1k | ARIN | US | 20th Nov 2003 |
| 69.9.161.0/24 | 256 | ARIN | US | 20th Oct 2025 |
| 69.9.162.0/23 | 512 | ARIN | US | 17th Dec 2025 |
| 69.9.164.0/22 | 1k | ARIN | US | 20th Nov 2025 |
| 69.9.175.0/24 | 256 | ARIN | US | 9th Dec 2025 |
| 69.90.236.0/22 | 1k | ARIN | US | 25th Jun 2025 |
| 69.90.248.0/22 | 1k | ARIN | US | 25th Jun 2025 |
| 69.90.40.0/22 | 1k | ARIN | US | 2nd Jul 2025 |
| 69.94.4.0/22 | 1k | ARIN | US | 4th Aug 2025 |
| 70.132.0.0/18 | 16.4k | ARIN | US | 27th Dec 2017 |
| 70.16.112.0/20 | 4.1k | ARIN | US | 30th Mar 2004 |
| 70.20.64.0/18 | 16.4k | ARIN | US | 30th Mar 2004 |
| 70.32.176.0/20 | 4.1k | ARIN | US | 23rd Mar 2009 |
| 70.32.224.0/19 | 8.2k | ARIN | US | 2nd Nov 2010 |
| 70.34.59.0/24 | 256 | ARIN | US | 12th Mar 2015 |
| 70.34.63.0/24 | 256 | ARIN | US | 12th Mar 2015 |
| 70.35.145.0/24 | 256 | ARIN | US | 28th Apr 2025 |
| 70.35.153.0/24 | 256 | ARIN | US | 9th Sept 2025 |
| 70.35.155.0/24 | 256 | ARIN | US | 13th May 2025 |
| 70.36.84.0/22 | 1k | ARIN | US | 9th Aug 2010 |
| 70.36.88.0/21 | 2k | ARIN | US | 9th Aug 2010 |
| 70.38.128.0/17 | 32.8k | ARIN | US | 22nd Jul 2008 |
| 70.42.117.0/24 | 256 | ARIN | US | 29th Sept 2005 |
| 70.42.118.0/24 | 256 | ARIN | US | 29th Sept 2005 |
| 70.42.119.0/24 | 256 | ARIN | US | 20th Nov 2023 |
| 70.42.212.0/23 | 512 | ARIN | US | 21st Sept 2023 |
| 70.42.214.0/23 | 512 | ARIN | US | 29th Sept 2005 |
| 70.84.0.0/14 | 262k | ARIN | US | 29th Jul 2004 |
| 71.160.0.0/16 | 65.5k | ARIN | US | 1st Jun 2005 |
| 71.161.80.0/20 | 4.1k | ARIN | US | 1st Jun 2005 |
| 71.169.192.0/18 | 16.4k | ARIN | US | 1st Jun 2005 |
| 71.180.0.0/16 | 65.5k | ARIN | US | 1st Jun 2005 |
| 71.241.160.0/19 | 8.2k | ARIN | US | 9th Nov 2004 |
| 71.254.16.0/20 | 4.1k | ARIN | US | 9th Nov 2004 |
| 72.0.80.0/20 | 4.1k | ARIN | US | 27th Sept 2007 |
| 72.1.40.0/22 | 1k | ARIN | US | 6th Feb 2006 |
| 72.1.44.0/23 | 512 | ARIN | US | 6th Feb 2006 |
| 72.13.64.0/20 | 4.1k | ARIN | US | 5th Nov 2004 |
| 72.13.96.0/20 | 4.1k | ARIN | US | 11th Nov 2004 |
| 72.14.117.0/24 | 256 | ARIN | US | 5th Nov 2004 |
| 72.14.120.0/24 | 256 | ARIN | US | 4th Nov 2020 |
| 72.14.121.0/24 | 256 | ARIN | US | 5th Nov 2004 |
| 72.14.122.0/23 | 512 | ARIN | US | 5th Nov 2004 |
| 72.14.68.0/23 | 512 | ARIN | US | 5th Nov 2004 |
| 72.15.32.0/20 | 4.1k | ARIN | US | 3rd Mar 2006 |
| 72.172.128.0/20 | 4.1k | ARIN | US | 2nd Jan 2007 |
| 72.172.80.0/22 | 1k | ARIN | US | 30th Sept 2020 |