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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
3,800 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 138.214.0.0/16 | 65.5k | ARIN |  CA | 31st May 1990 |
| 138.82.0.0/16 | 65.5k | ARIN | CA | 9th Mar 1990 |
| 139.64.244.0/22 | 1k | ARIN | CA | 1st Jul 2020 |
| 140.235.184.0/24 | 256 | ARIN | CA | 3rd Oct 2024 |
| 141.109.128.0/19 | 8.2k | ARIN | CA | 12th Jul 1990 |
| 141.193.128.0/22 | 1k | ARIN | CA | 1st Apr 2024 |
| 142.0.16.0/20 | 4.1k | ARIN | CA | 29th May 2012 |
| 142.10.0.0/16 | 65.5k | ARIN | CA | 30th Nov 1990 |
| 142.101.0.0/16 | 65.5k | ARIN | CA | 27th Jan 1992 |
| 142.102.0.0/16 | 65.5k | ARIN | CA | 27th Jan 1992 |
| 142.128.0.0/16 | 65.5k | ARIN | CA | 4th Mar 1992 |
| 142.130.0.0/16 | 65.5k | ARIN | CA | 8th Apr 1993 |
| 142.135.0.0/16 | 65.5k | ARIN | CA | 23rd Apr 1992 |
| 142.138.0.0/16 | 65.5k | ARIN | CA | 13th May 1992 |
| 142.147.100.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.15.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.50.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.66.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.74.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.78.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.80.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.148.0.0/17 | 32.8k | ARIN | CA | 19th Jun 1992 |
| 142.154.227.0/24 | 256 | ARIN | CA | 23rd Jul 1992 |
| 142.154.228.0/22 | 1k | ARIN | CA | 23rd Jul 1992 |
| 142.157.0.0/16 | 65.5k | ARIN | CA | 24th Jul 1992 |
| 142.168.0.0/16 | 65.5k | ARIN | CA | 18th Oct 1993 |
| 142.174.0.0/16 | 65.5k | ARIN | CA | 26th Aug 1992 |
| 142.175.0.0/16 | 65.5k | ARIN | CA | 26th Aug 1992 |
| 142.178.0.0/16 | 65.5k | ARIN | CA | 26th Aug 1992 |
| 142.193.0.0/16 | 65.5k | ARIN | CA | 18th Jan 1994 |
| 142.2.0.0/16 | 65.5k | ARIN | CA | 21st Sept 1990 |
| 142.202.12.0/22 | 1k | ARIN | CA | 18th Dec 2019 |
| 142.208.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.209.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.210.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.211.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.212.0.0/16 | 65.5k | ARIN | CA | 27th Oct 1992 |
| 142.218.0.0/16 | 65.5k | ARIN | CA | 15th Oct 1993 |
| 142.220.0.0/16 | 65.5k | ARIN | CA | 28th Oct 1992 |
| 142.223.0.0/16 | 65.5k | ARIN | CA | 10th Mar 1993 |
| 142.224.0.0/16 | 65.5k | ARIN | CA | 24th Mar 1994 |
| 142.226.0.0/16 | 65.5k | ARIN | CA | 18th Oct 1993 |
| 142.228.0.0/16 | 65.5k | 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 |