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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 199.202.68.0/22 | 1k | ARIN |  CA | 18th May 1994 |
| 199.202.89.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.90.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.92.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.93.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.202.94.0/24 | 256 | ARIN | CA | 18th Mar 1994 |
| 199.212.112.0/23 | 512 | ARIN | CA | 23rd Mar 1994 |
| 199.212.119.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.125.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.126.0/23 | 512 | ARIN | CA | 22nd Sept 1994 |
| 199.212.128.0/22 | 1k | ARIN | CA | 22nd Sept 1994 |
| 199.212.132.0/23 | 512 | ARIN | CA | 22nd Sept 1994 |
| 199.212.139.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.147.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.217.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.22.0/24 | 256 | ARIN | CA | 3rd Jun 1994 |
| 199.212.23.0/24 | 256 | ARIN | CA | 7th Jun 1994 |
| 199.212.233.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.236.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.212.237.0/24 | 256 | ARIN | CA | 16th May 1994 |
| 199.212.25.0/24 | 256 | ARIN | CA | 23rd Nov 1994 |
| 199.212.28.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.29.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.31.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.40.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.42.0/23 | 512 | ARIN | CA | 23rd Mar 1994 |
| 199.212.47.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.52.0/24 | 256 | ARIN | CA | 22nd Sept 1994 |
| 199.212.62.0/24 | 256 | ARIN | CA | 22nd Sept 1994 |
| 199.212.82.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.83.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.94.0/24 | 256 | ARIN | CA | 23rd Mar 1994 |
| 199.212.96.0/20 | 4.1k | ARIN | CA | 23rd Mar 1994 |
| 199.233.15.0/24 | 256 | ARIN | CA | 1st Aug 2017 |
| 199.233.171.0/24 | 256 | ARIN | CA | 24th Apr 1995 |
| 199.233.26.0/23 | 512 | ARIN | CA | 7th May 2012 |
| 199.24.0.0/15 | 131k | ARIN | CA | 14th Oct 1993 |
| 199.241.40.0/22 | 1k | ARIN | CA | 2nd Oct 2025 |
| 199.245.148.0/24 | 256 | ARIN | CA | 2nd Jul 2026 |
| 199.245.189.0/24 | 256 | ARIN | CA | 3rd Apr 2012 |
| 199.246.1.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.10.0/23 | 512 | ARIN | CA | 14th May 1994 |
| 199.246.104.0/23 | 512 | ARIN | CA | 14th May 1994 |
| 199.246.108.0/24 | 256 | ARIN | CA | 24th Jun 1994 |
| 199.246.109.0/24 | 256 | ARIN | CA | 24th Jun 1994 |
| 199.246.112.0/24 | 256 | ARIN | CA | 3rd Jun 1994 |
| 199.246.117.0/24 | 256 | ARIN | CA | 3rd Jun 1994 |
| 199.246.118.0/23 | 512 | ARIN | CA | 1st Jun 1994 |
| 199.246.12.0/22 | 1k | ARIN | CA | 14th May 1994 |
| 199.246.132.0/24 | 256 | ARIN | CA | 14th May 1994 |