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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks in Canada
3,779 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 216.10.69.0/24 | 256 | ARIN |  CA | 19th Dec 2022 |
| 216.108.162.0/23 | 512 | ARIN | CA | 9th Oct 1998 |
| 216.116.136.0/22 | 1k | ARIN | CA | 3rd Oct 2024 |
| 216.126.47.0/24 | 256 | ARIN | CA | 11th Jan 2021 |
| 216.129.194.0/24 | 256 | ARIN | CA | 25th Jul 2000 |
| 216.129.211.0/24 | 256 | ARIN | CA | 25th Jul 2000 |
| 216.14.128.0/20 | 4.1k | ARIN | CA | 25th Oct 2005 |
| 216.146.12.0/22 | 1k | ARIN | CA | 11th Apr 2022 |
| 216.150.0.0/24 | 256 | ARIN | CA | 14th Jul 1999 |
| 216.150.2.0/23 | 512 | ARIN | CA | 14th Jul 1999 |
| 216.150.20.0/23 | 512 | ARIN | CA | 14th Jul 1999 |
| 216.151.35.0/24 | 256 | ARIN | CA | 3rd Jan 2017 |
| 216.157.0.0/24 | 256 | ARIN | CA | 16th Dec 1998 |
| 216.162.64.0/20 | 4.1k | ARIN | CA | 30th Jul 1999 |
| 216.171.230.0/24 | 256 | ARIN | CA | 10th Jun 2002 |
| 216.171.236.0/24 | 256 | ARIN | CA | 10th Jun 2002 |
| 216.171.238.0/23 | 512 | ARIN | CA | 10th Jun 2002 |
| 216.183.0.0/19 | 8.2k | ARIN | CA | 22nd Dec 2000 |
| 216.20.208.0/20 | 4.1k | ARIN | CA | 11th Jan 2019 |
| 216.211.199.0/24 | 256 | ARIN | CA | 14th Apr 2023 |
| 216.211.218.0/24 | 256 | ARIN | CA | 4th Apr 2023 |
| 216.221.32.0/19 | 8.2k | ARIN | CA | 7th May 1999 |
| 216.240.0.0/20 | 4.1k | ARIN | CA | 16th Sept 1999 |
| 216.241.224.0/20 | 4.1k | ARIN | CA | 17th Nov 1999 |
| 216.246.224.0/19 | 8.2k | ARIN | CA | 31st Oct 2005 |
| 216.25.16.0/22 | 1k | ARIN | CA | 28th Jul 1998 |
| 216.252.212.0/22 | 1k | ARIN | CA | 4th May 2015 |
| 216.38.236.0/22 | 1k | ARIN | CA | 1st Apr 2024 |
| 216.52.222.0/24 | 256 | ARIN | CA | 16th Jul 2026 |
| 216.7.192.0/19 | 8.2k | ARIN | CA | 7th Feb 2001 |
| 216.87.222.0/24 | 256 | ARIN | CA | 13th Aug 1999 |
| 216.99.96.0/20 | 4.1k | ARIN | CA | 28th Oct 1998 |
| 23.128.82.0/24 | 256 | ARIN | CA | 10th Nov 2021 |
| 23.132.248.0/24 | 256 | ARIN | CA | 3rd Mar 2022 |
| 23.133.168.0/24 | 256 | ARIN | CA | 17th Mar 2022 |
| 23.134.48.0/24 | 256 | ARIN | CA | 14th May 2019 |
| 23.139.144.0/24 | 256 | ARIN | CA | 30th Jul 2019 |
| 23.139.16.0/24 | 256 | ARIN | CA | 24th Jul 2019 |
| 23.139.208.0/24 | 256 | ARIN | CA | 5th Aug 2019 |
| 23.143.112.0/24 | 256 | ARIN | CA | 15th Oct 2019 |
| 23.143.60.0/24 | 256 | ARIN | CA | 1st Aug 2025 |
| 23.144.240.0/24 | 256 | ARIN | CA | 25th Oct 2019 |
| 23.144.44.0/24 | 256 | ARIN | CA | 20th Aug 2025 |
| 23.146.192.0/24 | 256 | ARIN | CA | 23rd Oct 2017 |
| 23.146.193.0/24 | 256 | ARIN | CA | 21st Feb 2019 |
| 23.146.194.0/24 | 256 | ARIN | CA | 23rd Apr 2020 |
| 23.146.195.0/24 | 256 | ARIN | CA | 29th Oct 2020 |
| 23.146.28.0/24 | 256 | ARIN | CA | 24th Sept 2025 |
| 23.147.80.0/24 | 256 | ARIN | CA | 13th Dec 2019 |
| 23.148.192.0/24 | 256 | ARIN | CA | 27th Oct 2017 |