You mean to hide your bind version? Here's part of such tutorial: Hiding BIND version Login to your server through SSH and su to root. 1) pico -w /etc/named.conf 2) add this line: version "surely you must be joking"; after: query-source address * port 53; 3) Save the changes Ctrl+x then y 4) Restart your BIND service. service named restart or /etc/init.d/named restart 5) Check your bind version dig ns1.yourserver.com Code (markup): For complete tutorial (and this is for cPanel servers, but it should work on other servers which use bind also) you can check this link: http://www.webhostgear.com/86.html NOTE: You'll probably want to backup /etc/named.conf first, before editing it. In the case you mess something up, you'll have a working backup