# File rbot/auth.rb, line 110
    def userlevel(mask)
      # go through hostmask list, find match with _highest_ level (all users
      # will match *!*@*)
      level = 0
      @users.each {|user,userlevel|
        if(Irc.netmaskmatch(user, mask))
          level = userlevel if userlevel > level
        end
      }
      level
    end