Without knowing the domain name, it would be impossible to answer. For instance, if you have ebay.com, it is worth quite a bit. On the other hand cbqz.com is available and not worth anything unless you have a business which can make meaning out of if.
I agree phex.net means nothing to me (what is a phex anyway?) and its also a .net TLD which isn't as popular as .com but if you had a common 4 letter word like beer.net or host.net then that would be worth quite abit.
Was asking cause there's been visits to my site, but visitors were actually looking for the File-Sharing software Phex. And there seems to be other Phex stuff going on at google, so though it'd be of some value.