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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,463 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.163.156.0/24 | 256 | ARIN |  CA | 13th May 1994 |
| 198.163.176.0/23 | 512 | ARIN |  US | 8th Jun 1994 |
| 198.163.2.0/24 | 256 | ARIN | CA | 3rd Jun 1993 |
| 198.163.20.0/24 | 256 | ARIN | CA | 15th Jun 1993 |
| 198.163.21.0/24 | 256 | ARIN | CA | 15th Jun 1993 |
| 198.163.216.0/24 | 256 | ARIN | US | 5th Sept 2019 |
| 198.163.218.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.163.22.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.220.0/24 | 256 | ARIN | CA | 17th Nov 1993 |
| 198.163.224.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.163.226.0/24 | 256 | ARIN | CA | 17th Nov 1993 |
| 198.163.23.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.231.0/24 | 256 | ARIN | CA | 29th Oct 1997 |
| 198.163.236.0/24 | 256 | ARIN | CA | 17th Nov 1993 |
| 198.163.238.0/24 | 256 | ARIN | CA | 17th Nov 1993 |
| 198.163.24.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.240.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.163.242.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.163.244.0/22 | 1k | ARIN | CA | 17th Nov 1993 |
| 198.163.248.0/22 | 1k | ARIN | CA | 17th Nov 1993 |
| 198.163.25.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.252.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.163.254.0/24 | 256 | ARIN | CA | 17th Nov 1993 |
| 198.163.26.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.27.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.28.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.29.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.30.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.31.0/24 | 256 | ARIN | CA | 18th Jun 1993 |
| 198.163.4.0/24 | 256 | ARIN | CA | 20th Aug 1993 |
| 198.163.5.0/24 | 256 | ARIN | CA | 20th Aug 1993 |
| 198.163.70.0/24 | 256 | ARIN | CA | 28th Oct 1993 |
| 198.163.71.0/24 | 256 | ARIN | CA | 28th Oct 1993 |
| 198.163.72.0/23 | 512 | ARIN | CA | 2nd Nov 1993 |
| 198.163.74.0/24 | 256 | ARIN | US | 26th Nov 1993 |
| 198.163.76.0/22 | 1k | ARIN | CA | 17th Nov 1993 |
| 198.163.80.0/22 | 1k | ARIN | CA | 21st Dec 1993 |
| 198.163.84.0/22 | 1k | ARIN | CA | 27th Dec 1993 |
| 198.163.88.0/22 | 1k | ARIN | CA | 27th Dec 1993 |
| 198.163.93.0/24 | 256 | ARIN | CA | 13th Jan 1994 |
| 198.163.94.0/24 | 256 | ARIN | CA | 18th Jan 1994 |
| 198.163.96.0/21 | 2k | ARIN | CA | 19th Jan 1994 |
| 198.167.0.0/24 | 256 | ARIN | US | 2nd Apr 2013 |
| 198.167.1.0/24 | 256 | ARIN | CA | 4th Apr 1997 |
| 198.167.12.0/22 | 1k | ARIN | CA | 14th Dec 1993 |
| 198.167.128.0/24 | 256 | ARIN | CA | 24th Apr 1996 |
| 198.167.129.0/24 | 256 | ARIN | US | 2nd Apr 2013 |
| 198.167.160.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.167.161.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.167.162.0/24 | 256 | ARIN | CA | 14th Dec 1993 |