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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,251 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 67.221.247.0/24 | 256 | ARIN |  US | 10th Mar 2025 |
| 67.221.32.0/22 | 1k | ARIN | US | 17th Jan 2008 |
| 67.223.32.0/19 | 8.2k | ARIN | US | 14th Feb 2008 |
| 67.226.210.0/23 | 512 | ARIN | US | 17th Nov 2016 |
| 67.56.0.0/15 | 131k | ARIN | US | 20th Aug 2003 |
| 67.58.128.0/19 | 8.2k | ARIN | US | 18th Nov 2005 |
| 67.59.224.0/19 | 8.2k | ARIN | US | 15th Nov 2005 |
| 67.63.0.0/19 | 8.2k | ARIN | US | 18th Aug 2004 |
| 67.63.176.0/20 | 4.1k | ARIN | US | 30th Aug 2004 |
| 68.136.0.0/14 | 262k | ARIN | US | 13th May 2002 |
| 68.142.64.0/18 | 16.4k | ARIN | US | 17th Mar 2004 |
| 68.169.102.0/23 | 512 | ARIN | US | 21st Jan 2026 |
| 68.169.104.0/23 | 512 | ARIN | US | 26th Feb 2026 |
| 68.169.80.0/21 | 2k | ARIN | US | 30th Jan 2009 |
| 68.169.88.0/22 | 1k | ARIN | US | 30th Jan 2009 |
| 68.169.96.0/24 | 256 | ARIN | US | 15th Jan 2026 |
| 68.169.97.0/24 | 256 | ARIN | US | 13th Oct 2025 |
| 68.169.98.0/23 | 512 | ARIN | US | 16th Oct 2025 |
| 68.171.32.0/19 | 8.2k | ARIN | US | 26th Feb 2009 |
| 68.18.0.0/15 | 131k | ARIN | US | 11th Dec 2019 |
| 68.232.32.0/20 | 4.1k | ARIN | US | 5th Mar 2009 |
| 68.232.96.0/22 | 1k | ARIN | US | 6th Oct 2025 |
| 68.237.144.0/20 | 4.1k | ARIN | US | 18th Jul 2003 |
| 68.238.32.0/20 | 4.1k | ARIN | US | 18th Jul 2003 |
| 68.24.0.0/13 | 524k | ARIN | US | 14th Dec 2001 |
| 68.64.48.0/24 | 256 | ARIN | US | 25th Mar 2026 |
| 68.64.55.0/24 | 256 | ARIN | US | 25th Mar 2026 |
| 68.64.94.0/24 | 256 | ARIN | US | 17th Sept 2008 |
| 68.65.0.0/20 | 4.1k | ARIN | US | 2nd Sept 2009 |
| 68.65.176.0/20 | 4.1k | ARIN | US | 5th Sept 2008 |
| 68.67.115.0/24 | 256 | ARIN | US | 4th Mar 2026 |
| 68.68.121.0/24 | 256 | ARIN | US | 24th Feb 2014 |
| 68.68.125.0/24 | 256 | ARIN | US | 24th Feb 2014 |
| 68.68.48.0/20 | 4.1k | ARIN | US | 8th Sept 2008 |
| 68.69.56.0/21 | 2k | ARIN | US | 24th Jun 2009 |
| 69.10.248.0/21 | 2k | ARIN | US | 27th Mar 2007 |
| 69.12.24.0/24 | 256 | ARIN | US | 8th Oct 2013 |
| 69.12.41.0/24 | 256 | ARIN | US | 17th Sept 2015 |
| 69.12.67.0/24 | 256 | ARIN | US | 30th Jan 2025 |
| 69.164.0.0/18 | 16.4k | ARIN | US | 13th Feb 2009 |
| 69.165.0.0/20 | 4.1k | ARIN | US | 28th Sept 2009 |
| 69.168.16.0/20 | 4.1k | ARIN | US | 3rd Sept 2010 |
| 69.169.112.0/20 | 4.1k | ARIN | US | 10th Feb 2009 |
| 69.171.112.0/22 | 1k | ARIN | US | 23rd Jun 2008 |
| 69.171.116.0/24 | 256 | ARIN | US | 23rd Jun 2008 |
| 69.171.118.0/23 | 512 | ARIN | US | 23rd Jun 2008 |
| 69.173.0.0/19 | 8.2k | ARIN | US | 22nd Jul 2020 |
| 69.19.134.0/24 | 256 | ARIN | US | 23rd Jan 2003 |
| 69.19.135.0/24 | 256 | ARIN | US | 13th Feb 2012 |
| 69.19.161.0/24 | 256 | ARIN | US | 13th Feb 2012 |