PING www.52hdl.cn (104.21.62.242) 56(84) bytes of data.
64 bytes from 104.21.62.242 (104.21.62.242): icmp_seq=1 ttl=60 time=4.37 ms
64 bytes from 104.21.62.242 (104.21.62.242): icmp_seq=2 ttl=60 time=4.32 ms
64 bytes from 104.21.62.242 (104.21.62.242): icmp_seq=3 ttl=60 time=4.21 ms

--- www.52hdl.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 4.217/4.306/4.378/0.085 ms