Ummm, no. RIPE-NCC and APNIC also assign address space as regional
registries, CANET, JPNIC, KRNIC, and AUNIC/Telstra assign space as
national registries. One might claim the IANA has the ultimate
responsibility regarding address space, but this is somewhat
irrelevant to this discussion.
A minor clarification:
CANET does not run the Canadian IP registry; it is run by the University of
CANET does run a route registry for CANET customers.