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hizel
Erlang code IPv6
$ erl

1> gen_tcp:listen(5222, [inet, {ip,{0,0,0,0}}]).
{ok,#Port<0.484>}

2> gen_tcp:listen(5222, [inet6, {ip,{0,0,0,0,0,0,0,0}}]).
{error,eaddrinuse}

$ netstat -nl | grep 5222
tcp        0      0 0.0.0.0:5222            0.0.0.0:*               LISTEN