PING vietnamvisa.govt.vn (172.66.40.227) 56(84) bytes of data.
64 bytes from 172.66.40.227 (172.66.40.227): icmp_seq=1 ttl=59 time=4.44 ms
64 bytes from 172.66.40.227 (172.66.40.227): icmp_seq=2 ttl=59 time=4.21 ms
64 bytes from 172.66.40.227 (172.66.40.227): icmp_seq=3 ttl=59 time=4.18 ms

--- vietnamvisa.govt.vn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 4.181/4.278/4.440/0.115 ms