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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in Canada
3,775 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.163.116.0/23 | 512 | ARIN |  CA | 17th Nov 1993 |
| 198.163.156.0/24 | 256 | ARIN | CA | 13th May 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 |
| 198.163.218.0/23 | 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 |
| 198.163.76.0/22 | 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 |
| 198.167.1.0/24 | 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 |
| 198.167.160.0/24 | 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 |
| 198.167.2.0/24 | 256 | ARIN | CA | 15th Sept 1993 |
| 198.167.250.0/24 | 256 | ARIN | CA | 18th Feb 1997 |
| 198.167.251.0/24 | 256 | ARIN | CA | 24th Nov 1996 |
| 198.167.252.0/24 | 256 | ARIN | CA | 18th Apr 1996 |