[root@YMOS_DEFAULT ~]# dig @8.8.8.8 www.csdn.net; <<>> DiG 9.9.4-P2-RedHat-9.9.4-4.el6 <<>> @8.8.8.8 www.csdn.net; (1 server found);; global options: +cmd;; Got answer:;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6855;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1;; OPT PSEUDOSECTION:; EDNS: version: 0, flags:; udp: 512;; QUESTION SECTION:;www.csdn.net.                  IN      A;; ANSWER SECTION:www.csdn.net.           585     IN      CNAME   c55cb88f428db3438c2ff9b1b3a8962d.7cname.com.c55cb88f428db3438c2ff9b1b3a8962d.7cname.com. 585 IN A 14.17.64.102c55cb88f428db3438c2ff9b1b3a8962d.7cname.com. 585 IN A 117.25.140.102c55cb88f428db3438c2ff9b1b3a8962d.7cname.com. 585 IN A 121.12.124.102;; Query time: 153 msec;; SERVER: 8.8.8.8#53(8.8.8.8);; WHEN: Fri Nov 28 16:29:07 CST 2014;; MSG SIZE  rcvd: 146[root@YMOS_DEFAULT ~]#