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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.252.208.0/23 | 512 | ARIN |  US | 30th Nov 1993 |
| 198.252.210.0/24 | 256 | ARIN | US | 30th Nov 1993 |
| 198.252.212.0/22 | 1k | ARIN | US | 30th Nov 1993 |
| 198.252.216.0/23 | 512 | ARIN | US | 30th Nov 1993 |
| 198.252.218.0/24 | 256 | ARIN | US | 30th Nov 1993 |
| 198.252.219.0/24 | 256 | ARIN | US | 30th Nov 1993 |
| 198.252.220.0/24 | 256 | ARIN | US | 30th Nov 1993 |
| 198.252.221.0/24 | 256 | ARIN | US | 1st Dec 1993 |
| 198.252.233.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 198.252.234.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 198.252.235.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 198.252.236.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 198.252.237.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 198.252.238.0/23 | 512 | ARIN | US | 3rd Dec 1993 |
| 198.252.250.0/23 | 512 | ARIN | US | 3rd Dec 1993 |
| 198.252.254.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 198.252.32.0/19 | 8.2k | ARIN | US | 24th Nov 1993 |
| 198.254.0.0/20 | 4.1k | ARIN | US | 10th Sept 1993 |
| 198.254.24.0/23 | 512 | ARIN | US | 25th Feb 1994 |
| 198.254.32.0/19 | 8.2k | ARIN | US | 9th Sept 1993 |
| 198.27.0.0/24 | 256 | ARIN | US | 31st Jul 2013 |
| 198.27.16.0/21 | 2k | ARIN | US | 11th Dec 1992 |
| 198.27.2.0/23 | 512 | ARIN | US | 11th Dec 1992 |
| 198.27.24.0/22 | 1k | ARIN | US | 11th Dec 1992 |
| 198.27.56.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.28.130.0/23 | 512 | ARIN |  CA | 26th Jun 2024 |
| 198.28.136.0/21 | 2k | ARIN | US | 1st Jul 2019 |
| 198.28.192.0/18 | 16.4k | ARIN | US | 4th Apr 2012 |
| 198.29.240.0/21 | 2k | ARIN | US | 9th Mar 1993 |
| 198.29.248.0/22 | 1k | ARIN | US | 9th Mar 1993 |
| 198.29.4.0/23 | 512 | ARIN | US | 21st Dec 1992 |
| 198.29.6.0/24 | 256 | ARIN | US | 21st Dec 1992 |
| 198.29.66.0/23 | 512 | ARIN | US | 15th Jan 1993 |
| 198.29.68.0/22 | 1k | ARIN | US | 15th Jan 1993 |
| 198.29.72.0/21 | 2k | ARIN | US | 15th Jan 1993 |
| 198.32.100.0/22 | 1k | ARIN | US | 9th Dec 2009 |
| 198.32.112.0/21 | 2k | ARIN | US | 9th Dec 2009 |
| 198.32.120.0/22 | 1k | ARIN | US | 18th Dec 2009 |
| 198.32.124.0/23 | 512 | ARIN | US | 18th Dec 2009 |
| 198.32.128.0/23 | 512 | ARIN | US | 18th Dec 2009 |
| 198.32.132.0/24 | 256 | ARIN | US | 2nd May 2011 |
| 198.32.133.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.32.134.0/23 | 512 | ARIN | US | 9th Dec 2009 |
| 198.32.146.0/24 | 256 | ARIN | US | 9th Jun 1997 |
| 198.32.175.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.32.181.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.32.182.0/23 | 512 | ARIN | US | 9th Dec 2009 |
| 198.32.186.0/24 | 256 | ARIN | US | 19th May 2011 |
| 198.32.190.0/23 | 512 | ARIN | US | 9th Dec 2009 |
| 198.32.192.0/24 | 256 | ARIN | US | 9th Dec 2009 |