PING www.osuk.co.kr (18.239.36.55) 56(84) bytes of data.
64 bytes from server-18-239-36-55.ams58.r.cloudfront.net (18.239.36.55): icmp_seq=1
ttl=251 time=5.61 ms
64 bytes from server-18-239-36-55.ams58.r.cloudfront.net (18.239.36.55): icmp_seq=2
ttl=251 time=4.14 ms
64 bytes from server-18-239-36-55.ams58.r.cloudfront.net (18.239.36.55): icmp_seq=3
ttl=251 time=4.04 ms

--- www.osuk.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 4.043/4.602/5.615/0.719 ms