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A comment on This is a valid ipv4 address. Parent comment
http://[0:0:0:0:0:ffff:b8ac:a4a]
http://asdf:qwerty@3098282570/
http://asdf:qwerty@[0:0:0:0:0:ffff:b8ac:a4a]:80
(Might get a security/phishing warning on the last two links in some browsers.)
http://[0::0:ffff:b8ac:a4a]/
http://[0:0:0:0:0:ffff:b8ac:a4a]
http://asdf:qwerty@3098282570/
http://asdf:qwerty@[0:0:0:0:0:ffff:b8ac:a4a]:80
(Might get a security/phishing warning on the last two links in some browsers.)