To easily discern who owns a particular domain, visit the Internet Corporation for Assigned Names and Numbers (ICANN’s) site to perform a WHOIS search. Often a domain owner’s contact information will be available from the search results page. While many domain owners utilize services to protect their privacy, there should be a contact email you can access at the very least.
More often than not, domain owners squatting or using many sites to make money will make it fairly easy for you to contact them.