Carnegie Mellon University

Find the MAC Address

What is a MAC address?

A MAC (Media Access Control) address is a unique identification number assigned to a Network Interface Card (NIC) by the manufacturer. It is used to identify individual devices on the network, and is sometimes referred to as a hardware or physical address. It is 12 characters long consisting of digits (0-9) and letters (A-F). It can be represented in different notations depending on the manufacturer of the device.

How do I find the MAC address?

For computers - Follow the Windows or MAC instructions provided below.   

For smart devices - Most manufacturers will print the MAC address on a label on the back or on the bottom of the device. To find the MAC address quickly, it is recommended that you physically inspect your device for this label. If you cannot find the label or it is not printed on the device, you will need to go through the device’s system menus to find it. Refer to the list below for common devices and follow the suggested instructions.

Computers

Windows

  1. Open the command prompt using one of the following options:
    1. Press the Win + R keys, type cmd into the Open box, and then press Enter.
    2. Click Search Windows, type cmd into the Search box, and then press Enter.
  2. Type getmac/v at the prompt and press Enter
  3. Take note of the Physical Address information for you computer's Ethernet and wireless addresses (Wi-Fi) connections and then type exit.

MAC

  1. Select Apple menu > System Preferences.
  2. Select View > Network.
  3. Select your Ethernet connection and click Advanced
  4. Click Hardware
  5. Take note of the string next to the MAC address.