The first step is to perform a WHOIS search, which provides some information about the domain, including:
Registration Date
Who registered the domain name
When the domain name expires
Its registrar
Just keep in mind that the WHOIS is not what it used to be. Many registrars offer free or low-cost services to block the WHOIS information for their clients. In other circumstances, privacy laws have required registrars to prevent such information from being shared publicly.
If this is the case, we will need to do some deeper digging!