no ip domain-lookup Command

Router(config)#no ip domain-lookup Router(config)#	Turns off trying to automatically resolve an unrecognized command to a local host name

Tip:

Ever type in a command incorrectly and are left having to wait for a minute or two as the router tries to translate your command to a domain server of 255.255.255.255? The router is set by default to try to resolve any word that is not a command to a DNS server at address 255.255.255.255. If you are not going to set up DNS, turn this feature off to save you time as you type, especially if you are a poor typist.