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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 199.68.102.0/23 | 512 | ARIN |  US | 23rd May 2012 |
| 199.68.168.0/21 | 2k | ARIN | US | 4th Jan 2011 |
| 199.68.180.0/24 | 256 | ARIN |  CA | 6th Jan 2011 |
| 199.68.183.0/24 | 256 | ARIN | CA | 6th Jan 2011 |
| 199.68.24.0/23 | 512 | ARIN | US | 1st Dec 1993 |
| 199.68.4.0/23 | 512 | ARIN | US | 19th May 1994 |
| 199.68.52.0/24 | 256 | ARIN | US | 6th Dec 1993 |
| 199.68.64.0/21 | 2k | ARIN | US | 1st Dec 1993 |
| 199.68.8.0/22 | 1k | ARIN | US | 1st Dec 1993 |
| 199.68.96.0/22 | 1k | ARIN | US | 1st Dec 1993 |
| 199.7.0.0/20 | 4.1k | ARIN | US | 23rd Sept 1993 |
| 199.7.112.0/21 | 2k | ARIN |  BB | 26th Sept 2011 |
| 199.7.16.0/20 | 4.1k | ARIN | US | 14th Sept 1993 |
| 199.7.168.0/22 | 1k | ARIN |  PR | 15th Jun 2010 |
| 199.7.216.0/22 | 1k | ARIN | CA | 18th Jun 2010 |
| 199.7.47.0/24 | 256 | ARIN | US | 13th Feb 2025 |
| 199.7.76.0/24 | 256 | ARIN | US | 7th Nov 2005 |
| 199.7.78.0/23 | 512 | ARIN | US | 7th Nov 2005 |
| 199.7.80.0/24 | 256 | ARIN | US | 7th Nov 2005 |
| 199.7.81.0/24 | 256 | ARIN | US | 29th Nov 2006 |
| 199.7.86.0/24 | 256 | ARIN | US | 2nd Sept 2004 |
| 199.7.88.0/23 | 512 | ARIN | US | 19th Jun 2007 |
| 199.7.90.0/24 | 256 | ARIN |  MS | 10th Aug 2007 |
| 199.7.92.0/24 | 256 | ARIN | US | 2nd Sept 2004 |
| 199.7.93.0/24 | 256 | ARIN | US | 27th Nov 2017 |
| 199.71.1.0/24 | 256 | ARIN | CA | 4th Jan 1994 |
| 199.71.108.0/22 | 1k | ARIN | CA | 29th Mar 1994 |
| 199.71.112.0/24 | 256 | ARIN | CA | 29th Mar 1994 |
| 199.71.114.0/24 | 256 | ARIN | CA | 18th Apr 1994 |
| 199.71.116.0/23 | 512 | ARIN | CA | 19th Apr 1994 |
| 199.71.118.0/24 | 256 | ARIN | CA | 12th May 1994 |
| 199.71.119.0/24 | 256 | ARIN | CA | 11th May 1994 |
| 199.71.121.0/24 | 256 | ARIN | CA | 7th Apr 1994 |
| 199.71.122.0/24 | 256 | ARIN | CA | 5th Apr 1994 |
| 199.71.123.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.13.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 199.71.138.0/24 | 256 | ARIN | CA | 25th May 1994 |
| 199.71.14.0/23 | 512 | ARIN | CA | 14th Dec 1993 |
| 199.71.140.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 199.71.142.0/23 | 512 | ARIN | US | 4th Jun 2012 |
| 199.71.148.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.151.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.152.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.153.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.155.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.156.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.157.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.158.0/24 | 256 | ARIN | CA | 1st Dec 1993 |
| 199.71.159.0/24 | 256 | ARIN | US | 31st Aug 2015 |
| 199.71.16.0/20 | 4.1k | ARIN | CA | 14th Dec 1993 |