How to Change the MAC Address on a Motorola SB5100


Manufacturers of network equipment such as routers or modems assign a special unique identifier, the Media Access Control, or MAC, address, to each device during production. This identifier allows network devices to identify and communicate with each other. The Motorola SB5100 is a cable modem that allows you to connect to the Internet using the standard cable television infrastructure. Using the Motorola SB5100's Web settings interface, you can change its default MAC address, which is a required step when setting up complex networks with multiple modems or routers.

  • Open your Web browser and type "" into the address bar. Press "Enter" to load the Motorola SB5100's Web settings interface.

  • Log in by using "admin" as the username and your password. If you have never changed the default password of the modem, you can use "admin" as the password as well, which is the default factory password. Click "OK."

  • Click on "Advanced" in the left pane. Click on the "MAC" tab.

  • Click on the "Clone MAC address" check box to activate it. Type the MAC address you want to use in the field next to it. Click "Save" to save your new settings. Your Motorola SB5100 modem will now reboot, which should take less than a minute.

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