PING web20vn.com--hljdx.520edu.com (166.75.50.22) 56(84) bytes of data.
64 bytes from 166.75.50.22 (166.75.50.22): icmp_seq=1 ttl=54 time=301 ms
64 bytes from 166.75.50.22 (166.75.50.22): icmp_seq=2 ttl=54 time=300 ms
64 bytes from 166.75.50.22 (166.75.50.22): icmp_seq=3 ttl=54 time=300 ms

--- web20vn.com--hljdx.520edu.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 300.793/301.005/301.288/0.493 ms