A method of tracking domain sales of premium domains is by keeping an eye on their DNS.
When a sale occurs, buyers of premium domains such as LLL .com are keen on changing the domain nameservers immediately.
Such swift changes indicate that a sale completed, as installment sales via escrow such as Escrow.com retain the escrow DNS until paid off.
Jamie Zoch of DotWeekly spotted two potential sales of premium quality three letter .com domains, by observing how their DNS changed.
It goes without saying that dozens, if not hundreds, of domain sales occur without any public recording of their particulars; such “digging” up of details in WHOIS changes is a great add-on to domain sales tracking tools such as NameBio.