PING underground-www.shanghaicaidi.com (104.21.86.148) 56(84) bytes of data.
64 bytes from 104.21.86.148 (104.21.86.148): icmp_seq=1 ttl=60 time=7.00 ms
64 bytes from 104.21.86.148 (104.21.86.148): icmp_seq=2 ttl=60 time=4.17 ms
64 bytes from 104.21.86.148 (104.21.86.148): icmp_seq=3 ttl=60 time=4.17 ms

--- underground-www.shanghaicaidi.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 4.175/5.121/7.009/1.335 ms