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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 148.117.0.0/16 | 65.5k | ARIN |  CA | 2nd Apr 1991 |
| 148.59.141.0/24 | 256 | ARIN | CA | 1st Jul 2026 |
| 148.59.216.0/23 | 512 | ARIN | CA | 29th Jun 2016 |
| 148.59.232.0/22 | 1k | ARIN | CA | 21st Nov 2025 |
| 148.85.176.0/21 | 2k | ARIN | CA | 25th Aug 2026 |
| 149.112.119.0/24 | 256 | ARIN | CA | 5th Dec 2024 |
| 149.112.134.0/23 | 512 | ARIN | CA | 18th Jun 2025 |
| 149.112.181.0/24 | 256 | ARIN | CA | 2nd Dec 2025 |
| 149.112.182.0/24 | 256 | ARIN | CA | 8th Dec 2025 |
| 149.112.203.0/24 | 256 | ARIN | CA | 9th Nov 2026 |
| 149.112.204.0/24 | 256 | ARIN | CA | 9th Nov 2026 |
| 149.112.26.0/24 | 256 | ARIN | CA | 16th Nov 2021 |
| 149.112.28.0/24 | 256 | ARIN | CA | 23rd Mar 2022 |
| 149.112.54.0/24 | 256 | ARIN | CA | 29th Mar 2023 |
| 149.112.55.0/24 | 256 | ARIN | CA | 29th Mar 2023 |
| 149.112.58.0/23 | 512 | ARIN | CA | 12th Apr 2023 |
| 149.112.74.0/24 | 256 | ARIN | CA | 29th Sept 2023 |
| 149.112.80.0/24 | 256 | ARIN | CA | 30th Nov 2023 |
| 149.248.168.0/23 | 512 | ARIN | CA | 2nd Sept 2015 |
| 149.248.224.0/21 | 2k | ARIN | CA | 22nd Sept 2020 |
| 149.248.232.0/21 | 2k | ARIN | CA | 9th Jul 2020 |
| 149.248.240.0/21 | 2k | ARIN | CA | 26th Mar 2020 |
| 149.248.248.0/22 | 1k | ARIN | CA | 26th Feb 2020 |
| 149.248.252.0/23 | 512 | ARIN | CA | 2nd Sept 2015 |
| 149.248.254.0/23 | 512 | ARIN | CA | 17th Jan 2020 |
| 153.79.64.0/21 | 2k | ARIN | CA | 2nd Sept 2026 |
| 153.79.96.0/21 | 2k | ARIN | CA | 22nd Sept 2026 |
| 155.103.148.0/22 | 1k | ARIN | CA | 13th Jan 2026 |
| 155.103.192.0/24 | 256 | ARIN | CA | 13th Jan 2026 |
| 155.15.0.0/16 | 65.5k | ARIN | CA | 30th Oct 1991 |
| 156.9.200.0/22 | 1k | ARIN | CA | 6th Oct 2026 |
| 158.106.240.0/21 | 2k | ARIN | CA | 20th May 2015 |
| 158.128.0.0/16 | 65.5k | ARIN | CA | 30th Mar 1992 |
| 158.163.0.0/16 | 65.5k | ARIN | CA | 18th Mar 1992 |
| 158.51.0.0/23 | 512 | ARIN | CA | 3rd Jan 2020 |
| 158.51.228.0/22 | 1k | ARIN | CA | 17th Jan 2020 |
| 159.177.0.0/16 | 65.5k | ARIN | CA | 12th May 1992 |
| 159.194.193.0/24 | 256 | RIPE NCC | CA | 26th May 1992 |
| 159.32.0.0/16 | 65.5k | ARIN | CA | 2nd Mar 1992 |
| 159.55.0.0/16 | 65.5k | ARIN | CA | 6th Mar 1992 |
| 161.129.30.0/24 | 256 | ARIN | CA | 29th Mar 2018 |
| 161.129.96.0/19 | 8.2k | ARIN | CA | 29th Mar 2018 |
| 161.187.0.0/16 | 65.5k | ARIN | CA | 15th Jan 1993 |
| 162.208.12.0/22 | 1k | ARIN | CA | 25th Mar 2013 |
| 162.208.60.0/22 | 1k | ARIN | CA | 1st Apr 2013 |
| 162.210.32.0/22 | 1k | ARIN | CA | 16th Apr 2013 |
| 162.212.64.0/21 | 2k | ARIN | CA | 16th May 2013 |
| 162.217.60.0/22 | 1k | ARIN | CA | 14th Apr 2017 |
| 162.218.32.0/21 | 2k | ARIN | CA | 31st Jul 2013 |
| 162.248.120.0/21 | 2k | ARIN | CA | 12th Nov 2013 |