Actually, I believe that dnexe.com makes more a reference to an executable file (exe), therefore a program of some kind. The 'dn' part might be related to DNS, so your site might offer some kind of program that has something to do with domains (a finder maybe...).
Good luck with this one Simon, it has a great potential.
And just so you know everyone, I found the perfect domain name for my new blog, but I won't tell anyone yet! :P