PING web20vn.com--www.yf1618.com (104.21.54.8) 56(84) bytes of data.
64 bytes from 104.21.54.8 (104.21.54.8): icmp_seq=1 ttl=60 time=5.56 ms
64 bytes from 104.21.54.8 (104.21.54.8): icmp_seq=2 ttl=60 time=4.03 ms
64 bytes from 104.21.54.8 (104.21.54.8): icmp_seq=3 ttl=60 time=4.02 ms

--- web20vn.com--www.yf1618.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.020/4.541/5.569/0.728 ms