A Media Access Control address (MAC address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. The MAC Address ensures the computer device's physical location. It helps us to identify a given device on the available network uniquely. The MAC address is manufactured into every network card, such as an Ethernet card or Wi-Fi card, and therefore cannot be changed. MAC addresses are recognizable as six groups of two hexadecimal digits, separated by hyphens, colons, or without a separator. Hence MAC address is a unique number that identifies a device connected to the internet. Additional InformationFrame check sequence (FCS) is an error-detecting code added to a frame in a communication protocol. Frames are used to send payload data from a source to a destination. A port number is a way to identify a specific process to which an internet or other network message is to be forwarded when it arrives at a server. A Uniform Resource Locator also referred to as URL is the unique address used to identify a Web site. It is similar to a home address, used to identify someone's mailing address.