How can I see who last paid for a domain?
For payments after Nov 16, 2007 the whois server will report the
email address of the user who last paid for a domain for payments after Nov 16, 2007.
You can also as the whois server for more information about that
user with a command like, "whois -h whois.ai joe.smith@test.com"
New users (after Nov 16, 2007) have to have their information
verified before they can pay for a domain, so the info should
be accurate for new users.