What command provides information about who owns a domain?

The command that provides information about who owns a domain is "whois." This utility queries databases that store registered users or assignees of a domain name or an IP address. When you execute a whois command followed by a domain name, the returned data includes details like the registrant's contact information, the domain's creation and expiration dates, and the registrar responsible for the domain's registration.

Other commands listed have different functions. For example, "host" is primarily used to perform DNS lookups, returning information about mappings between domain names and IP addresses. "dig" (Domain Information Groper) is another DNS lookup tool, providing detailed information about DNS records for a domain. Meanwhile, "traceroute" is a network diagnostic tool used to track the path packets take from one device to another across the network. Each of these commands serves specific networking and diagnostic purposes but does not provide domain ownership information like "whois."