When DNSLister says a domain is available, we want to be sure. The best tool for that is RDAP, the Registration Data Access Protocol. It's the modern, machine-readable replacement for WHOIS: you ask the registry about a name, and it answers in clean JSON with "registered" or "not found". There's one catch: you have to know which server to ask. How RDAP servers are found IANA, the organization that runs the root of…