PING rockinkorea.co.kr (18.239.36.113) 56(84) bytes of data.
64 bytes from server-18-239-36-113.ams58.r.cloudfront.net (18.239.36.113): icmp_seq=1
ttl=251 time=4.96 ms
64 bytes from server-18-239-36-113.ams58.r.cloudfront.net (18.239.36.113): icmp_seq=2
ttl=251 time=3.88 ms
64 bytes from server-18-239-36-113.ams58.r.cloudfront.net (18.239.36.113): icmp_seq=3
ttl=251 time=3.91 ms

--- rockinkorea.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 3.883/4.254/4.961/0.500 ms