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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
Browse by registry
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.84.61.0/24 | 256 | ARIN |  CA | 8th Dec 1993 |
| 199.84.64.0/19 | 8.2k | ARIN | CA | 10th Feb 1994 |
| 199.84.8.0/21 | 2k | ARIN | CA | 16th Dec 1993 |
| 199.85.102.0/23 | 512 | ARIN | CA | 14th Feb 1994 |
| 199.85.104.0/23 | 512 | ARIN | CA | 14th Feb 1994 |
| 199.85.106.0/24 | 256 | ARIN | CA | 14th Feb 1994 |
| 199.85.108.0/22 | 1k | ARIN | CA | 26th Jan 1994 |
| 199.85.112.0/22 | 1k | ARIN | CA | 26th Jan 1994 |
| 199.85.116.0/23 | 512 | ARIN |  US | 27th Jul 2012 |
| 199.85.128.0/18 | 16.4k | ARIN | CA | 6th Jan 1994 |
| 199.85.16.0/23 | 512 | ARIN | CA | 10th Dec 1993 |
| 199.85.18.0/24 | 256 | ARIN | CA | 10th Dec 1993 |
| 199.85.194.0/24 | 256 | ARIN | CA | 27th Jan 1994 |
| 199.85.195.0/24 | 256 | ARIN | CA | 26th Jan 1994 |
| 199.85.196.0/22 | 1k | ARIN | CA | 26th Jan 1994 |
| 199.85.2.0/23 | 512 | ARIN | CA | 31st Jan 1994 |
| 199.85.201.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.85.216.0/22 | 1k | ARIN | US | 12th Mar 2009 |
| 199.85.24.0/24 | 256 | ARIN | CA | 16th Feb 1994 |
| 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 |
| 199.85.247.0/24 | 256 | ARIN | CA | 4th Jan 1994 |
| 199.85.248.0/23 | 512 | ARIN | CA | 4th Jan 1994 |
| 199.85.25.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 199.85.250.0/24 | 256 | ARIN | US | 4th Jan 1994 |
| 199.85.251.0/24 | 256 | ARIN | CA | 4th Jan 1994 |
| 199.85.254.0/24 | 256 | ARIN | CA | 3rd Jan 1994 |
| 199.85.26.0/23 | 512 | ARIN | US | 12th May 1994 |
| 199.85.28.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 199.85.29.0/24 | 256 | ARIN | CA | 22nd Feb 1994 |
| 199.85.30.0/23 | 512 | ARIN | CA | 22nd Feb 1994 |
| 199.85.32.0/20 | 4.1k | ARIN | CA | 18th Feb 1994 |
| 199.85.4.0/23 | 512 | ARIN | CA | 13th May 1994 |
| 199.85.48.0/21 | 2k | ARIN | CA | 18th Feb 1994 |
| 199.85.56.0/22 | 1k | ARIN | CA | 18th Feb 1994 |
| 199.85.6.0/24 | 256 | ARIN | CA | 8th Jul 1994 |
| 199.85.60.0/23 | 512 | ARIN | CA | 18th Feb 1994 |
| 199.85.62.0/24 | 256 | ARIN | CA | 18th Feb 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 |
| 199.85.99.0/24 | 256 | ARIN | CA | 17th Feb 1994 |
| 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 |
| 199.87.244.0/22 | 1k | ARIN | CA | 18th Nov 2019 |
| 199.87.26.0/23 | 512 | ARIN | US | 1st Aug 2012 |
| 199.87.32.0/21 | 2k | ARIN | US | 13th Dec 1993 |