PING www.mastas.co.kr (121.175.247.160) 56(84) bytes of data.
64 bytes from 121.175.247.160 (121.175.247.160): icmp_seq=1 ttl=57 time=257 ms
64 bytes from 121.175.247.160 (121.175.247.160): icmp_seq=2 ttl=57 time=256 ms
64 bytes from 121.175.247.160 (121.175.247.160): icmp_seq=3 ttl=57 time=256 ms

--- www.mastas.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 256.957/257.119/257.432/0.625 ms