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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 162.254.172.0/22 | 1k | ARIN |  CA | 2nd May 2014 |
| 162.254.40.0/22 | 1k | ARIN | CA | 27th Feb 2014 |
| 162.255.228.0/22 | 1k | ARIN | CA | 27th Jun 2014 |
| 163.123.217.0/24 | 256 | ARIN | CA | 30th Sept 2020 |
| 163.182.164.0/24 | 256 | ARIN | CA | 8th Jan 2020 |
| 165.140.107.0/24 | 256 | ARIN | CA | 7th Oct 2021 |
| 165.140.142.0/24 | 256 | ARIN | CA | 5th Oct 2021 |
| 167.11.0.0/16 | 65.5k | ARIN | CA | 14th Apr 1993 |
| 167.253.31.0/24 | 256 | ARIN | CA | 4th Apr 2024 |
| 167.253.76.0/23 | 512 | ARIN | CA | 10th Apr 2024 |
| 167.33.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.34.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.35.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.36.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.38.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.39.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.41.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.42.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.45.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.47.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.48.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.49.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.50.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.51.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.52.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.53.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.54.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.55.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.74.0.0/18 | 16.4k | ARIN | CA | 11th May 1993 |
| 167.74.64.0/20 | 4.1k | ARIN | CA | 11th May 1993 |
| 167.74.96.0/19 | 8.2k | ARIN | CA | 11th May 1993 |
| 167.88.52.0/22 | 1k | ARIN | CA | 12th Jul 2019 |
| 167.88.96.0/21 | 2k | ARIN | CA | 29th Sept 2026 |
| 167.94.166.0/24 | 256 | ARIN | CA | 1st Nov 2021 |
| 168.113.224.0/22 | 1k | RIPE NCC | CA | 24th Mar 1994 |
| 168.113.231.0/24 | 256 | RIPE NCC | CA | 24th Mar 1994 |
| 168.151.17.0/24 | 256 | ARIN | CA | 16th Jan 2019 |
| 168.222.184.0/24 | 256 | RIPE NCC | CA | 12th Aug 1994 |
| 168.245.128.0/23 | 512 | ARIN | CA | 16th Jan 2018 |
| 170.39.100.0/24 | 256 | ARIN | CA | 3rd Oct 2024 |
| 170.39.6.0/24 | 256 | ARIN | CA | 26th Jun 2020 |
| 170.39.96.0/23 | 512 | ARIN | CA | 1st Jul 2020 |
| 170.62.41.0/24 | 256 | ARIN | CA | 5th Feb 2024 |
| 172.102.128.0/21 | 2k | ARIN | CA | 29th Sept 2026 |
| 172.82.40.0/22 | 1k | ARIN | CA | 9th Apr 2021 |
| 172.83.56.0/22 | 1k | ARIN | CA | 18th Jan 2018 |
| 172.93.80.0/20 | 4.1k | ARIN | CA | 25th Jun 2015 |
| 172.96.40.0/21 | 2k | ARIN | CA | 9th Jun 2015 |
| 172.97.60.0/22 | 1k | ARIN | CA | 12th Jun 2015 |
| 172.99.164.0/22 | 1k | ARIN | CA | 13th Jan 2021 |