The resolution of domain.ca is done by authoritative DNS servers. These can be reachable by IPv4 and IPv6. This graph shows how many .ca domains are resolved by DNS servers reachable by IPv6.

     shows the number of .ca domains resolved by DNS servers with an IPv6 address record.

     shows the subset of the other line (    ) by showing the servers that are reachable by IPv6.

     shows the number of .ca domains resolved by DNS servers with either or both IPv4 and IPv6 addresses.