PING www.ledongjianfei.com (38.21.19.19) 56(84) bytes of data.
64 bytes from 38.21.19.19 (38.21.19.19): icmp_seq=1 ttl=122 time=147 ms
64 bytes from 38.21.19.19 (38.21.19.19): icmp_seq=2 ttl=122 time=144 ms
64 bytes from 38.21.19.19 (38.21.19.19): icmp_seq=3 ttl=122 time=144 ms

--- www.ledongjianfei.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 144.125/145.294/147.597/1.628 ms