[root@centos6 ~]# host -t PTR 192.168.209.100 192.168.209.6
Using domain server:
Name: 192.168.209.6
Address: 192.168.209.6#53
Aliases: vim
100.209.168.192.in-addr.arpa domain name pointer ftp.xuepeng.com.
[root@centos6 ~]# host -t ns 209.168.192.in-addr.arpa 192.168.209.6
Using domain server:
Name: 192.168.209.6
Address: 192.168.209.6#53
Aliases: centos
209.168.192.in-addr.arpa name server ns1.209.168.192.in-addr.arpa.服務器