Edit: Oops. Not sure why my tiny little post took over half an hour to put together, but yup, I'm overlapping.
Necessary backtracking: Is it your own server or shared? If shared, are you allowed to have fully functional htaccess files? ("Allowed" here means "it will work".)
What happens if you add your own IP to the "deny from" list? Do you just cruise on in as if nothing had happened?
Any change if you put it into Title Case ("Allow,Deny")? Most Apache installations don't care, but occasionally one does.
I was apprehensive about the trailing . in some of the partial IPs, but checked it and it doesn't seem to make any difference.