PING www.bksd.or.kr (18.239.36.71) 56(84) bytes of data.
64 bytes from server-18-239-36-71.ams58.r.cloudfront.net (18.239.36.71): icmp_seq=1
ttl=251 time=4.67 ms
64 bytes from server-18-239-36-71.ams58.r.cloudfront.net (18.239.36.71): icmp_seq=2
ttl=251 time=4.46 ms
64 bytes from server-18-239-36-71.ams58.r.cloudfront.net (18.239.36.71): icmp_seq=3
ttl=251 time=4.39 ms

--- www.bksd.or.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2004ms
rtt min/avg/max/mdev = 4.391/4.509/4.674/0.132 ms