Whois Lookup & IP _ Whois.pdf

RIPE Whois Database Query Reference Manual — RIPE Network Coordination Centre

How can one find the owner of a domain if it's hidden by a proxy besides going to law enforcement? Also, is it possible if the same domain is parked? - Quora

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Using Whois - American Registry for Internet Numbers

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DomainTools Whois Lookup 1.1 Free Download