Dynamic IP Restrictions an Extension for IIS 7.0 and IIS 6.0 available for download from the above link. It allows you to secure your site from Brute-force, Denial of Service attacks, by temporarily blocking Internet Protocol (IP) addresses of HTTP clients who follow a pattern that could be conducive to one of such attacks. This module can be configured such that the analysis and blocking could be done at the Web Server or the Web Site level.
Dynamic IP Restrictions for IIS also maintains support for the functionality already provided by IPv4 Address and Domain Restrictions in IIS 7.0, thus allowing IT Administrators to build and use a static list of IP addresses and Domain Names that are denied or granted access.
So You can download and it will seamlessly integrate with IIS 7.0 and will provide you much comfort with added security!