QQ uses UDP to communicate with the outside world. The port of entry is different from the port of exit.

&# 160; UDP & # 160； 8000; &# 160; This is fixed, no matter how much QQ is opened in the intranet;

&# 160; UDP & # 160； 400 times:  Starting from 4000, every time you open a QQ, you will open an additional 400x port.