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73416ba
(Get the code!)
It's 2015, we really should support IPv6! :)
Probably the biggest problem out of the cases listed above is the "HOST.IPADDRESS" column. If the IP address of an MNet host comes back as IPv6, this bug would prevent it from being useable.
In the other cases, it's only a problem if you're accessing a server by its IP address instead of by a hostname. If you're doing admin type stuff, and the server you need to connect to doesn't have a hostname for some reason, there is the workaround of assigning the IP a hostname in the /etc/hosts file.
I guess there's also the scenario where you are a user trying to specify an IP address, like maybe putting one in for the URL of an RSS feed. But that seems like it should be somewhat rarer. There are not that many web servers that are only identified by IP address.