DNS delegation of facebook.tk updated: May 21, 2013 2:11:22 PM
We pick i.root-servers.net, one of the 13 root servers (1), and ask it about facebook.tk and learn that tk is delegated to four name servers (2), so we ask b.ns.tk where we learn that facebook.tk is delegated to two name servers, including ns66.domaincontrol.com (3), so we ask that one and get the following answer:
Facebook.tk is a domain controlled by two domain name servers at domaincontrol.com having a total of four IP numbers. All four of them are on different IP networks. Incoming mail for facebook.tk is handled by two mail servers at secureserver.net having a total of three IP numbers. There are three duplicated IP numbers. Two of them are on the same IP network. Facebook.tk has one IP number (22.214.171.124), but the reverse is ?.