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=5.07 ms
64 bytes from 104.21.73.71 (104.21.73.71): icmp_seq=2 ttl=60 time=4.70 ms
64 bytes from 104.21.73.71 (104.21.73.71): icmp_seq=3 ttl=60 time=4.80 ms

--- underground-www.pinmer.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.709/4.865/5.079/0.175 ms