Looking port for spesific application
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# lsof -i -n -P COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME ntpd 1748 ntp 4u IPv4 2487 UDP *:123 ntpd 1748 ntp 5u IPv6 2488 UDP *:123 ntpd 1748 ntp 6u IPv4 2489 UDP 127.0.0.1:123 ntpd 1748 ntp 7u IPv4 2490 UDP 202.156.81.23:123 ntpd 1748 ntp 8u IPv4 2491 UDP 202.156.81.68:123 sshd 1797 root 3u IPv6 2669 TCP *:22 (LISTEN) oidentd 2025 nobody 5u IPv6 3399 TCP *:113 (LISTEN)
