PING smtt.co.kr (221.139.49.6) 56(84) bytes of data.
64 bytes from 221.139.49.6 (221.139.49.6): icmp_seq=1 ttl=46 time=244 ms
64 bytes from 221.139.49.6 (221.139.49.6): icmp_seq=2 ttl=46 time=244 ms
64 bytes from 221.139.49.6 (221.139.49.6): icmp_seq=3 ttl=46 time=244 ms

--- smtt.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 244.251/244.506/244.787/0.219 ms