PING wwww.goodteacn.com (104.21.11.168) 56(84) bytes of data.
64 bytes from 104.21.11.168 (104.21.11.168): icmp_seq=1 ttl=60 time=4.35 ms
64 bytes from 104.21.11.168 (104.21.11.168): icmp_seq=2 ttl=60 time=4.22 ms
64 bytes from 104.21.11.168 (104.21.11.168): icmp_seq=3 ttl=60 time=4.30 ms

--- wwww.goodteacn.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 4.220/4.290/4.351/0.092 ms