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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 199.89.201.0/24 | 256 | ARIN |  US | 25th Feb 1994 |
| 199.89.202.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.203.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.204.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.205.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.208.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.210.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.211.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.213.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.215.0/24 | 256 | ARIN | US | 19th Jul 2021 |
| 199.89.217.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.218.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.219.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.220.0/24 | 256 | ARIN | US | 20th Nov 2015 |
| 199.89.223.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.225.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.226.0/24 | 256 | ARIN | US | 25th Feb 1994 |
| 199.89.227.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.228.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.231.0/24 | 256 | RIPE NCC |  DE | 28th Feb 1994 |
| 199.89.232.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.233.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.234.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.235.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.89.236.0/22 | 1k | ARIN | US | 28th Feb 1994 |
| 199.89.240.0/23 | 512 | ARIN | US | 28th Feb 1994 |
| 199.89.242.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.243.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.244.0/23 | 512 | ARIN | US | 28th Feb 1994 |
| 199.89.246.0/24 | 256 | ARIN | US | 28th Feb 1994 |
| 199.89.248.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.89.249.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.89.253.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.89.32.0/20 | 4.1k | ARIN | US | 23rd Feb 1994 |
| 199.89.48.0/24 | 256 | ARIN | US | 23rd Feb 1994 |
| 199.89.49.0/24 | 256 | ARIN | US | 24th Sept 2015 |
| 199.89.56.0/21 | 2k | ARIN | US | 10th Mar 2009 |
| 199.9.20.0/22 | 1k | ARIN |  CA | 30th Dec 2020 |
| 199.9.24.0/21 | 2k | APNIC |  HK | 15th Oct 2008 |
| 199.9.248.0/21 | 2k | ARIN | US | 15th Oct 2008 |
| 199.91.0.0/21 | 2k | ARIN | US | 4th Jan 1994 |
| 199.91.132.0/22 | 1k | ARIN | US | 4th Feb 2011 |
| 199.91.16.0/20 | 4.1k | RIPE NCC |  CH | 1st Sept 1993 |
| 199.91.168.0/22 | 1k | ARIN | US | 8th Feb 2011 |
| 199.91.172.0/22 | 1k | ARIN | US | 8th Feb 2011 |
| 199.91.222.0/23 | 512 | ARIN | US | 10th Feb 2011 |
| 199.91.236.0/22 | 1k | ARIN | US | 11th Feb 2011 |
| 199.91.42.0/23 | 512 | ARIN | US | 14th Aug 2012 |
| 199.91.88.0/22 | 1k | ARIN | US | 30th Jan 2012 |
| 199.96.12.0/22 | 1k | ARIN | US | 16th Mar 2009 |