PING www.com--www.shanghaicaidi.com (104.21.91.122) 56(84) bytes of data.
64 bytes from 104.21.91.122 (104.21.91.122): icmp_seq=1 ttl=60 time=4.54 ms
64 bytes from 104.21.91.122 (104.21.91.122): icmp_seq=2 ttl=60 time=3.88 ms
64 bytes from 104.21.91.122 (104.21.91.122): icmp_seq=3 ttl=60 time=4.01 ms

--- www.com--www.shanghaicaidi.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 3.887/4.148/4.545/0.285 ms