Internet Protocol (IP) Numbers (IP addresses) : A unique number that distinguishes hosts and networks. IP addresses represent a piece of a universal standard that is used to identify systems connected to the Internet. The numbers that are translate into a domain name.

ISP : ISP is stands for Internet Service Provider. Typically a small or large business that supplies access to the internet, although an individual person may be equipped to do so. It is common for ISPs to provide web hosting, domain registrations and other services that are related, The company that provides internet connection.

IANA : IANA is stands for Internet Assigned Numbers Authority. An organization who oversees core internet infrastructure management parameters, including port assignments .

ICANN : ICANN is stands for Internet Corporation for Assigned Names and Numbers. The not for profit organization responsible for managing the internet's domain name system, including IP address space allocation.

InterNIC : InterNIC is the official source for internet. InterNIC was originally started as a joint effort between Network Solutions and AT&T, to perform many of the functions now performed by ICANN. The InterNIC is no longer functioning, but hosts an information site regarding domain name registrations.