PING www.chedu.co.kr (13.227.219.99) 56(84) bytes of data.
64 bytes from server-13-227-219-99.ams54.r.cloudfront.net (13.227.219.99): icmp_seq=1
ttl=249 time=6.76 ms
64 bytes from server-13-227-219-99.ams54.r.cloudfront.net (13.227.219.99): icmp_seq=2
ttl=249 time=4.19 ms
64 bytes from server-13-227-219-99.ams54.r.cloudfront.net (13.227.219.99): icmp_seq=3
ttl=249 time=4.21 ms

--- www.chedu.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.191/5.055/6.760/1.207 ms