Re: colons for separators I think we should just define a .ip6 pseudo-tld and then you can write e.g. ff::12:34 as ff.x.12.34.ip6 (with .x. being the equivalen

Re: colons for separators I think we should just define a .ip6 pseudo-tld and then you can write e.g. ff::12:34 as ff.x.12.34.ip6 (with .x. being the equivalent of ::). This should be enough for any practical purpose of users specifying free-form addresses, where the address can be ipv4, ipv6 or a host name. For configuration files and the like where you're only writing IPs, the colon form would be acceptable as well. The good part about this is that it also won't require us updating any address validation regexes (of which there must be many, despite all the advice against it).