Yaah.. Don't realize that is soo big.. And thanks for explanation.. That explain all

And also a mistake in the my 1 post.. I add in the server list a server with port 765567 not 76567.. For that mIRC show
[21:50:08] * Connecting to 172.16.0.5 (44671).
//echo zz $calc((65536 * 11) - 765567) <- -44671
/server server 727563 same /server server 6667 That can be confusing for some ppl(like me some hours ago)

The Unix aplication use same think..
Fri Jan 23 21:44:30 :Listener created :0.0.0.0 port 765567 and i connected succefuly with mIRC..
That must be described in some RFC ?
Ok.. Learned somethink new..