There are MANY such tools around, of varying quality. But because such tools are used to promote paid services in many cases, our Forum Charter [webmasterworld.com] here asks this:
Tool Talk There are many tools and services for working with domain names, seeing if they've already been indexed, researching their past, their historical Page Rank and backlinks, etc.
Please do not ask about, criticize, or recommend any specific tools in your post. We don't want to give unfair promotion to anyone - or get into a fighting match with those who code tools, many of whom are your fellow members here.