Step1. netstat -tnlp
and then find the Program name
[root@study /]# netstat -tlunp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:514 0.0.0.0:* LISTEN 1711/rsyslogd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/systemd
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 2411/dnsmasq
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1274/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1264/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 8264/master
tcp6 0 0 :::514 :::* LISTEN 1711/rsyslogd
tcp6 0 0 :::111 :::* LISTEN 1/systemd
tcp6 0 0 :::80 :::* LISTEN 1714/httpd
tcp6 0 0 :::21 :::* LISTEN 1717/vsftpd
tcp6 0 0 :::22 :::* LISTEN 1274/sshd
tcp6 0 0 ::1:631 :::* LISTEN 1264/cupsd
tcp6 0 0 ::1:25 :::* LISTEN 8264/master
udp 0 0 0.0.0.0:46637 0.0.0.0:* 881/avahi-daemon: r
udp 0 0 192.168.122.1:53 0.0.0.0:* 2411/dnsmasq
udp 0 0 0.0.0.0:67 0.0.0.0:* 2411/dnsmasq
udp 0 0 0.0.0.0:111 0.0.0.0:* 1/systemd
udp 0 0 0.0.0.0:5353 0.0.0.0:* 881/avahi-daemon: r
udp 0 0 127.0.0.1:323 0.0.0.0:* 897/chronyd
udp6 0 0 :::111 :::* 1/systemd
udp6 0 0 :::35040 :::* 881/avahi-daemon: r
udp6 0 0 :::5353 :::* 881/avahi-daemon: r
udp6 0 0 ::1:323 :::* 897/chronyd
[root@study /]#
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