IP address/Hostname

IP Address
Also referred to as Internet protocol address. A unique number that identifies a networked system so that it may communicate via Internet protocols. It consists of four numbers separated by periods. Most often, each part of the IP address is a number between 0 and 225; however, the first number must be less than 224 and the last number cannot be 0. IP addresses are logically divided into two parts: the network (similar to a telephone area code), and the system on the network (similar to a phone number).

Hostname
The alphabetic form of the name assigned to a computer on the Internet. This term is also used for fully qualified domain name (FQDN). example: The FQDN www.hexamail.com will be the aplphabetical form of the servers IP address 195.204.232.150.