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The devices and computers connected to Ethernet must have their own addresses to communicate on the network.

For Ethernet, the addresses which the user needs to consider are basically IP addresses.

The MAC address (Media Access Control Address) is a unique physical address which is assigned to each network device.

(No other devices have the same MAC address.)

In Ethernet, it is shown as a 6-byte codę: a vender codę of 3 bytes (managed by IEEE management) indicating an equipment manufacturer and a node number of 3 bytes (managed by each manufacturer). (¹1)

As each Ethernet-connected device communicates automatically getting a MAC address from IP addresses designated by the user, the user need not be take account of it.

The MAC address is sometimes called "Ethernet address" or "Internet address", however, notę that it differs from the IP address described below.

1

1 MAC address of the Ethernet module is indicated in MAC ADD. of the rating piąte located on the side of the module.