如何獲取連接到外部ip的pid號？

一些程序從我的本地 ip 111.111.111.111 與 130.239.18.176:80 連接，如何獲取 pid 號？

netstat  -np
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 111.111.111.111:46243    52.89.80.240:443        TIME_WAIT   -               
tcp        0      1 111.111.111.111:36553    173.239.79.210:443      SYN_SENT    2630/firefox-esr
tcp        0      0 111.111.111.111:48470    130.239.18.176:80       ESTABLISHED -               
tcp        0      1 111.111.111.111:36552    173.239.79.210:443      SYN_SENT    2630/firefox-esr
tcp        0      1 111.111.111.111:34202    74.125.204.101:80       SYN_SENT    2630/firefox-esr
tcp        0      0 111.111.111.111:52243    203.208.48.79:443       ESTABLISHED 2630/firefox-esr
tcp        0      1 111.111.111.111:46521    74.125.203.93:443       SYN_SENT    2630/firefox-esr
tcp        0      1 111.111.111.111:34200    74.125.204.101:80       SYN_SENT    2630/firefox-esr
tcp        0      0 111.111.111.111:48424    130.239.18.176:80       ESTABLISHED -               
tcp        0      0 111.111.111.111:46238    52.89.80.240:443        TIME_WAIT   -               
tcp        0      1 111.111.111.111:46523    74.125.203.93:443       SYN_SENT    2630/firefox-esr
tcp        0      0 111.111.111.111:34204    74.125.204.101:80       TIME_WAIT   -               
tcp        0      0 111.111.111.111:33700    104.24.98.177:443       ESTABLISHED 2630/firefox-esr
tcp        0      1 111.111.111.111:34206    74.125.204.101:80       SYN_SENT    2630/firefox-esr
tcp        0      0 127.0.0.1:49941         127.0.0.1:80            ESTABLISHED 2630/firefox-esr

netstat輸出很好地解釋了它：

（並非所有程序都可以辨識，不會顯示非擁有程序資訊，您必須是 root 才能看到所有內容。）

只需以root身份執行它（例如sudo netstat -np）

引用自：https://unix.stackexchange.com/questions/348084