Trace DNS Delegation
This function will trace the DNS delegation for a domain name from the Internet DNS root servers down to the DNS servers responsible (authoritative) for the domain. This can be useful to find out if a domain is delegated correctly.
Just like a DNS server resolving a domain name, this function will pick DNS servers in random order (given multiple choices). Therefore results may vary if you do the same trace several times and different DNS servers have different data for the domain name. For example if a domain name registration has just been updated and the new delegation hasn't reached all the parent level DNS servers yet.
If you enter an IP address (IPv4 or IPv6), the reverse DNS PTR-record name for the IP address will be traced.
(More information about reverse DNS delegation).