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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,315 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.83.96.0/22 | 1k | ARIN |  US | 18th Jan 2012 |
| 199.84.0.0/24 | 256 | ARIN | US | 15th Nov 2012 |
| 199.85.116.0/23 | 512 | ARIN | US | 27th Jul 2012 |
| 199.85.216.0/22 | 1k | ARIN | US | 12th Mar 2009 |
| 199.85.240.0/22 | 1k | ARIN | US | 13th Mar 2009 |
| 199.85.244.0/24 | 256 | ARIN | US | 21st Sept 2015 |
| 199.85.246.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.85.250.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.85.26.0/23 | 512 | ARIN | US | 12th May 1994 |
| 199.85.7.0/24 | 256 | ARIN | US | 9th Sept 2015 |
| 199.85.89.0/24 | 256 | ARIN | US | 10th May 2016 |
| 199.85.91.0/24 | 256 | ARIN | US | 5th Oct 2016 |
| 199.85.96.0/23 | 512 | ARIN | US | 27th Jul 2012 |
| 199.87.160.0/22 | 1k | ARIN | US | 31st Jan 2011 |
| 199.87.209.0/24 | 256 | ARIN | US | 12th Dec 2017 |
| 199.87.215.0/24 | 256 | ARIN | US | 22nd Dec 2017 |
| 199.87.26.0/23 | 512 | ARIN | US | 1st Aug 2012 |
| 199.87.32.0/21 | 2k | ARIN | US | 13th Dec 1993 |
| 199.87.40.0/22 | 1k | ARIN | US | 13th Dec 1993 |
| 199.88.0.0/20 | 4.1k | ARIN | US | 13th Dec 1993 |
| 199.88.128.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.129.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.130.0/24 | 256 | ARIN | US | 20th Nov 2015 |
| 199.88.132.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.133.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.136.0/23 | 512 | ARIN | US | 7th Aug 2012 |
| 199.88.138.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.140.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.142.0/23 | 512 | ARIN | US | 10th Feb 1994 |
| 199.88.144.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.145.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.146.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.147.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.148.0/23 | 512 | ARIN | US | 10th Feb 1994 |
| 199.88.150.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.151.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.88.152.0/23 | 512 | ARIN | US | 10th Feb 1994 |
| 199.88.154.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.155.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.156.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.157.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.159.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.160.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.161.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.162.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.163.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.164.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.168.0/24 | 256 | ARIN | US | 14th Feb 1994 |
| 199.88.169.0/24 | 256 | ARIN | US | 15th Feb 1994 |
| 199.88.170.0/24 | 256 | ARIN | US | 15th Feb 1994 |