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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.73.168.0/24 | 256 | ARIN |  CA | 29th Apr 1993 |
| 198.73.169.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.170.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.171.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 198.73.177.0/24 | 256 | ARIN | CA | 24th Jun 1993 |
| 198.73.179.0/24 | 256 | ARIN | CA | 6th May 1993 |
| 198.73.182.0/24 | 256 | ARIN | CA | 10th May 1993 |
| 198.73.185.0/24 | 256 | ARIN | CA | 10th May 1993 |
| 198.73.187.0/24 | 256 | ARIN | CA | 12th May 1993 |
| 198.73.188.0/24 | 256 | ARIN | CA | 12th May 1993 |
| 198.73.189.0/24 | 256 | ARIN | CA | 13th May 1993 |
| 198.73.191.0/24 | 256 | ARIN | CA | 17th May 1993 |
| 198.73.211.0/24 | 256 | ARIN | CA | 19th Feb 1993 |
| 198.73.216.0/23 | 512 | ARIN | CA | 16th Feb 1993 |
| 198.73.219.0/24 | 256 | ARIN | CA | 18th May 1993 |
| 198.73.221.0/24 | 256 | ARIN | CA | 2nd Apr 2026 |
| 198.73.251.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.73.252.0/24 | 256 | ARIN | CA | 22nd Jun 1993 |
| 198.73.31.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.33.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.34.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.35.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.36.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.37.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.39.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.40.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.41.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.42.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.43.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.44.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.45.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.46.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.47.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.48.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.49.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.52.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.54.0/24 | 256 | ARIN | CA | 15th Aug 2023 |
| 198.73.83.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.84.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.85.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.86.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.87.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.88.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.89.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.90.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.91.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.92.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.93.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.94.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.89.12.0/23 | 512 | ARIN | CA | 5th Mar 1993 |