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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Canada
3,775 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.188.71.0/24 | 256 | ARIN |  CA | 1st May 2012 |
| 199.189.236.0/22 | 1k | ARIN | CA | 19th Aug 2011 |
| 199.189.4.0/23 | 512 | ARIN | CA | 8th Mar 1994 |
| 199.19.172.0/22 | 1k | ARIN | CA | 30th Sept 2025 |
| 199.195.114.0/23 | 512 | ARIN | CA | 31st Jul 2015 |
| 199.195.228.0/22 | 1k | ARIN | CA | 7th Jun 2012 |
| 199.195.232.0/22 | 1k | ARIN | CA | 3rd Oct 2025 |
| 199.198.140.0/22 | 1k | ARIN | CA | 25th Mar 1994 |
| 199.198.160.0/20 | 4.1k | ARIN | CA | 25th Mar 1994 |
| 199.198.176.0/21 | 2k | ARIN | CA | 25th Mar 1994 |
| 199.198.184.0/23 | 512 | ARIN | CA | 25th Mar 1994 |
| 199.198.186.0/24 | 256 | ARIN | CA | 13th Apr 2011 |
| 199.198.187.0/24 | 256 | ARIN | CA | 25th Mar 1994 |
| 199.198.188.0/22 | 1k | ARIN | CA | 25th Mar 1994 |
| 199.198.192.0/20 | 4.1k | ARIN | CA | 25th Mar 1994 |
| 199.198.208.0/23 | 512 | ARIN | CA | 25th Mar 1994 |
| 199.198.218.0/24 | 256 | ARIN | CA | 14th Mar 1994 |
| 199.201.121.0/24 | 256 | ARIN | CA | 14th Aug 2019 |
| 199.201.226.0/23 | 512 | ARIN | CA | 5th May 1994 |
| 199.201.228.0/23 | 512 | ARIN | CA | 5th May 1994 |
| 199.202.102.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.112.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.113.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.136.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.140.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.149.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.150.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.151.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.152.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.155.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.156.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.160.0/21 | 2k | ARIN | CA | 18th Mar 1994 |
| 199.202.168.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.170.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.172.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.176.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.180.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.184.0/21 | 2k | ARIN | CA | 18th Mar 1994 |
| 199.202.192.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.194.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.196.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.197.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.199.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.201.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.202.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.205.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.206.0/23 | 512 | ARIN | CA | 18th Mar 1994 |
| 199.202.208.0/22 | 1k | ARIN | CA | 18th Mar 1994 |
| 199.202.65.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.66.0/23 | 512 | ARIN | CA | 18th May 1994 |