PING cuhkacs.org (104.21.32.1) 56(84) bytes of data.
64 bytes from 104.21.32.1 (104.21.32.1): icmp_seq=1 ttl=60 time=6.32 ms
64 bytes from 104.21.32.1 (104.21.32.1): icmp_seq=2 ttl=60 time=3.86 ms
64 bytes from 104.21.32.1 (104.21.32.1): icmp_seq=3 ttl=60 time=3.98 ms

--- cuhkacs.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 3.869/4.727/6.324/1.130 ms