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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
3,819 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 142.228.44.0/23 | 512 | ARIN |  CA | 30th Dec 1992 |
| 142.228.46.0/23 | 512 | ARIN | CA | 12th Aug 2026 |
| 142.228.56.0/21 | 2k | ARIN | CA | 30th Dec 1992 |
| 142.228.64.0/18 | 16.4k | ARIN | CA | 30th Dec 1992 |
| 142.228.8.0/21 | 2k | ARIN | CA | 30th Dec 1992 |
| 142.235.0.0/16 | 65.5k | ARIN | CA | 6th May 1993 |
| 142.248.12.0/22 | 1k | ARIN | CA | 10th Oct 2025 |
| 142.248.156.0/24 | 256 | ARIN | CA | 10th Oct 2025 |
| 142.248.60.0/23 | 512 | ARIN | CA | 20th Oct 2025 |
| 142.249.124.0/24 | 256 | ARIN | CA | 9th Oct 2025 |
| 142.253.0.0/16 | 65.5k | ARIN | CA | 11th Aug 1993 |
| 142.37.0.0/16 | 65.5k | ARIN | CA | 9th Apr 1991 |
| 142.38.0.0/16 | 65.5k | ARIN | CA | 9th Apr 1991 |
| 142.42.0.0/16 | 65.5k | ARIN | CA | 26th Feb 1993 |
| 142.45.0.0/16 | 65.5k | ARIN | CA | 26th Mar 1990 |
| 142.48.0.0/15 | 131k | ARIN | CA | 26th Mar 1990 |
| 142.5.0.0/16 | 65.5k | ARIN | CA | 30th Jun 1990 |
| 142.50.0.0/16 | 65.5k | ARIN | CA | 26th Mar 1990 |
| 142.53.0.0/16 | 65.5k | ARIN | CA | 13th May 1991 |
| 142.62.0.0/16 | 65.5k | ARIN | CA | 18th Jun 1991 |
| 142.63.0.0/16 | 65.5k | ARIN | CA | 18th Jun 1991 |
| 142.69.0.0/16 | 65.5k | ARIN | CA | 11th Jul 1991 |
| 142.7.0.0/16 | 65.5k | ARIN | CA | 30th Nov 1990 |
| 142.71.0.0/16 | 65.5k | ARIN | CA | 26th Mar 1990 |
| 142.72.0.0/16 | 65.5k | ARIN | CA | 6th Jun 1994 |
| 142.8.0.0/16 | 65.5k | ARIN | CA | 30th Nov 1990 |
| 142.95.0.0/16 | 65.5k | ARIN | CA | 3rd Jan 1992 |
| 142.96.0.0/16 | 65.5k | ARIN | CA | 3rd Jan 1992 |
| 142.97.0.0/16 | 65.5k | ARIN | CA | 26th Mar 1990 |
| 142.99.0.0/20 | 4.1k | ARIN | CA | 7th Jan 1992 |
| 142.99.104.0/23 | 512 | ARIN | CA | 7th Jan 1992 |
| 142.99.112.0/20 | 4.1k | ARIN | CA | 7th Jan 1992 |
| 142.99.16.0/22 | 1k | ARIN | CA | 7th Jan 1992 |
| 142.99.24.0/21 | 2k | RIPE NCC | CA | 7th Jan 1992 |
| 142.99.32.0/19 | 8.2k | ARIN | CA | 7th Jan 1992 |
| 142.99.64.0/19 | 8.2k | ARIN | CA | 7th Jan 1992 |
| 147.160.148.0/24 | 256 | ARIN | CA | 9th Sept 2019 |
| 148.117.0.0/16 | 65.5k | ARIN | CA | 2nd Apr 1991 |
| 148.59.129.0/24 | 256 | ARIN | CA | 27th Nov 2023 |
| 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 |
| 149.112.119.0/24 | 256 | ARIN | CA | 5th Dec 2024 |
| 149.112.134.0/23 | 512 | ARIN | CA | 18th Jun 2025 |
| 149.112.136.0/23 | 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 |
| 149.112.26.0/24 | 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 |