[giaour]

Shouldn't it be the same for the US and Canada? Both are administered by NANPA. Last time I looked into this (early 2020), you generally couldn't get porting info for US numbers, though original issuer was public and easily accessible.

[Scoundreller]

Since US and Can have number portability, it’s managed by a Number Portability Administrator. That’s Neustar in Canada:

https://www.npac.com/canadian-number-portability/the-npac-ne...