you should always have both entired in your DNS as below: Hostname Type Target .locatefirst.com A 194.1.150.100 www.locatefirst.com A 194.1.150.100 this makes sure anyone not typing www will get to your site
Well I have my site configured to add www. to the domain even when someone enters it without it. I just always liked the www. added. Reason unknown :/