PING wcnmb.tjcdn.com (31.57.138.12) 56(84) bytes of data.
64 bytes from 31.57.138.12 (31.57.138.12): icmp_seq=1 ttl=58 time=18.8 ms
64 bytes from 31.57.138.12 (31.57.138.12): icmp_seq=2 ttl=58 time=16.5 ms
64 bytes from 31.57.138.12 (31.57.138.12): icmp_seq=3 ttl=58 time=16.4 ms

--- wcnmb.tjcdn.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 16.455/17.303/18.883/1.118 ms