Which tool is commonly used to look up domain ownership, including contact details, though privacy options may hide information?

• A. Whois
• B. Nslookup
• C. Dig
• D. Arp

Answer: (A)

Looking up who owns a domain and how to contact them is done with a whois lookup. This tool queries registration data stored by domain registries and registrars, returning details such as the registrant’s name, organization, contact address, email, and phone number when disclosed. Even if privacy or proxy services mask some information, whois is still the standard way to see what ownership data is publicly available and who manages the domain.

Other options are DNS-focused tools that don't provide ownership details. Nslookup and dig fetch DNS records like A, MX, and NS records, not registration or contact information. Arp is used to map IP addresses to MAC addresses on a local network, which has nothing to do with domain ownership.