PING joonjeong.kr (76.76.21.21) 56(84) bytes of data.
64 bytes from 76.76.21.21 (76.76.21.21): icmp_seq=1 ttl=251 time=4.26 ms
64 bytes from 76.76.21.21 (76.76.21.21): icmp_seq=2 ttl=251 time=3.85 ms
64 bytes from 76.76.21.21 (76.76.21.21): icmp_seq=3 ttl=251 time=3.86 ms

--- joonjeong.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 3.855/3.997/4.268/0.191 ms