It's 2001::0:8080 port 80. Require the brackets for specifying a port number with a v6 address, and don't accept a port without the brackets. That way there's n

It's 2001::0:8080 port 80. Require the brackets for specifying a port number with a v6 address, and don't accept a port without the brackets. That way there's no ambiguity.