PING www.kicoa.or.kr (18.239.83.44) 56(84) bytes of data.
64 bytes from server-18-239-83-44.ams58.r.cloudfront.net (18.239.83.44): icmp_seq=1
ttl=251 time=4.16 ms
64 bytes from server-18-239-83-44.ams58.r.cloudfront.net (18.239.83.44): icmp_seq=2
ttl=251 time=4.23 ms
64 bytes from server-18-239-83-44.ams58.r.cloudfront.net (18.239.83.44): icmp_seq=3
ttl=251 time=4.09 ms

--- www.kicoa.or.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.093/4.165/4.238/0.059 ms