The Root Zone Database page of the Internet Assigned Numbers Authority (IANA):
a) performs a reverse lookeup, y taking a phone number and looking up the name associated with it.
b) associates information such as IP address to the name of the resource itself.
c) lists all top-level domains, including .com, .edu, .org, and also shows two-character country codes.
d) contains the name, address, and phone number of administrative, billing, and technical contacts of the domain name.