Check for Valid URLs Rapidly - Using Rotating IP and Proxies - Mac OS

I need a piece of software, preferably desktop based for Mac OS, that cycles through an increasing integer and enters it into a URL. The software should check if the URL leads to a valid product page, and if so, saving the integer in a list within the software's GUI. The general template would require the base site address, and the starting integer. Both numbers defined by the user. For instance: http://(sitenamehere)/cart/(integer here):1 So (sitenamehere) would be the site we're scraping info on, and (integer here) would be the number we are starting at. The software should increase by one integer for every check, and should use Rotating IPs and proxies to avoid bans. I would like to software to perform these checks as quickly as possible, looking to check about 800k-1 million product pages per day.