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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks in Canada
3,830 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.235.186.0/23 | 512 | ARIN |  CA | 27th Jul 1993 |
| 198.235.188.0/22 | 1k | ARIN | CA | 27th Jul 1993 |
| 198.235.192.0/23 | 512 | ARIN | CA | 27th Jul 1993 |
| 198.235.194.0/23 | 512 | ARIN | CA | 27th Jul 1993 |
| 198.235.196.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.235.197.0/24 | 256 | ARIN | CA | 8th Nov 1993 |
| 198.235.2.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 198.235.206.0/23 | 512 | ARIN | CA | 4th Nov 1993 |
| 198.235.220.0/22 | 1k | ARIN | CA | 8th Nov 1993 |
| 198.235.224.0/21 | 2k | ARIN | CA | 8th Nov 1993 |
| 198.235.232.0/22 | 1k | ARIN | CA | 8th Nov 1993 |
| 198.235.236.0/24 | 256 | ARIN | CA | 9th Nov 1993 |
| 198.235.237.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.235.238.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.235.240.0/21 | 2k | ARIN | CA | 17th Nov 1993 |
| 198.235.248.0/22 | 1k | ARIN | CA | 17th Nov 1993 |
| 198.235.25.0/24 | 256 | ARIN | CA | 30th Sept 1993 |
| 198.235.252.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.235.254.0/24 | 256 | ARIN | CA | 15th May 1994 |
| 198.235.26.0/24 | 256 | ARIN | CA | 30th Sept 1993 |
| 198.235.28.0/23 | 512 | ARIN | CA | 30th Sept 1993 |
| 198.235.3.0/24 | 256 | ARIN | CA | 11th May 1994 |
| 198.235.31.0/24 | 256 | ARIN | CA | 30th Sept 1993 |
| 198.235.4.0/22 | 1k | ARIN | CA | 6th Aug 1993 |
| 198.235.48.0/23 | 512 | ARIN | CA | 23rd May 1994 |
| 198.235.50.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 198.235.51.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 198.235.52.0/23 | 512 | ARIN | CA | 23rd May 1994 |
| 198.235.56.0/24 | 256 | ARIN | CA | 1st Jun 1994 |
| 198.235.62.0/24 | 256 | ARIN | CA | 1st Jun 1994 |
| 198.235.8.0/24 | 256 | ARIN | CA | 12th Aug 1993 |
| 198.235.9.0/24 | 256 | ARIN | CA | 12th Aug 1993 |
| 198.251.32.0/22 | 1k | ARIN | CA | 2nd Oct 2026 |
| 198.252.128.0/22 | 1k | ARIN | CA | 22nd Nov 1993 |
| 198.28.130.0/23 | 512 | ARIN | CA | 26th Jun 2024 |
| 198.28.8.0/22 | 1k | ARIN | CA | 1st Oct 2026 |
| 198.33.0.0/21 | 2k | ARIN | CA | 23rd Dec 1992 |
| 198.33.10.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.33.112.0/21 | 2k | ARIN | CA | 23rd Dec 1992 |
| 198.33.14.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.33.160.0/20 | 4.1k | ARIN | CA | 23rd Dec 1992 |
| 198.33.18.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.33.20.0/22 | 1k | ARIN | CA | 23rd Dec 1992 |
| 198.33.208.0/22 | 1k | ARIN | CA | 23rd Dec 1992 |
| 198.33.244.0/22 | 1k | ARIN | CA | 23rd Dec 1992 |
| 198.33.26.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.33.28.0/22 | 1k | ARIN | CA | 23rd Dec 1992 |
| 198.33.32.0/22 | 1k | ARIN | CA | 23rd Dec 1992 |
| 198.33.36.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.33.50.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |