How can I block my competitor's IP address range from my website?
Are you looking for free network tools to find an IP address range? This advice from our security expert shows you whois tools available to you and then explains how to block these ranges from viewing your Web resources, in this expert response.
The next step would be to take a look at one of the regional RIR's (Regional Internet Registry). The RIR's are...
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the organizations overseeing the allocation and registration of Internet number resources within a particular region of the world. For the US, the site to review is www.ARIN.net -- the American Registry for Internet Numbers (ARIN). You will need to enter the IP address of the organization's Web server. Look over the results as there should be a sub net mask provided and a range.
While this will provide you the information needed to block your competitors IP address range they could always use a proxy, such as TOR, to get around this restriction.