The Google Cache Checker is a tool for displaying cached pages and for determining the exact date and time at which the website was cached. The Google cache is a snapshot of the page. Google creates a snapshot of every website and stores (cachet) this snapshot as a backup. Enter the URL to find out.
Check the server response of just one or a large batch of URLs to see which ones might be redirected or which ones might come up 404 not found, and then the list is available for download. The longer the list of URLs, the longer the tool will take to run.