Your real world mailing address is published in WHOIS ("who is") by default, often you have to pay the registrar extra to keep it private, which is admittedly a

Your real world mailing address is published in WHOIS ("who is") by default, often you have to pay the registrar extra to keep it private, which is admittedly a total scam. You could use a fake one, but then it eliminates a way to verify you own the domain. The WHOIS client is in most distros, try it out.