PING khls.ac.kr (180.131.16.75) 56(84) bytes of data.
64 bytes from mail.js4web.com (180.131.16.75): icmp_seq=1 ttl=47 time=265 ms
64 bytes from mail.js4web.com (180.131.16.75): icmp_seq=2 ttl=47 time=262 ms
64 bytes from mail.js4web.com (180.131.16.75): icmp_seq=3 ttl=47 time=264 ms

--- khls.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2263ms
rtt min/avg/max/mdev = 262.831/264.252/265.768/1.200 ms