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Establish who registered and who operates a domain using WHOIS, RDAP, and DNS. Use when running a whois lookup, querying RDAP, digging A/AAAA/MX/NS/TXT/SOA/CAA records, reading SPF includes, DKIM selectors or DMARC rua addresses, finding the registrar, registrant, or nameservers, doing reverse DNS/PTR or ASN and netblock lookups, or hunting historical WHOIS and passive DNS for a domain.