PING underground-www.pinmer.cn (104.21.73.71) 56(84) bytes of data.
64 bytes from 104.21.73.71 (104.21.73.71): icmp_seq=1 ttl=60 time=5.39 ms
64 bytes from 104.21.73.71 (104.21.73.71): icmp_seq=2 ttl=60 time=5.47 ms
64 bytes from 104.21.73.71 (104.21.73.71): icmp_seq=3 ttl=60 time=5.43 ms

--- underground-www.pinmer.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 5.392/5.434/5.475/0.091 ms