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This is one of the most popular tools to find out the owner, internet provider and location of any website, domain or IP address. Checking IP addresses is useful for locating the origin of unwanted emails or the source of spam, virus and attacks.
It will show you the registered WHOIS and ARIN contact data of the domain owner and the company operating the associated server, no matter where he is located. For dynamic IP addresses of private users you may find out their internet service provider allowing to contact him for a complaint.