How to Login into Arris Motorola SB6121 Router

Hello, Please let me know that how to login into Arris Motorola SB6121 router. I am not able to login into this Arris router, Facing some issue in this. Help me.

  • Zane

  • 1


  • 1 year ago

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Answer - 1

Arris router is beneficial for those who are using cable TV systems and facilitates high bandwidth data transfer. It is a multipurpose device which can perform various functions.

We can log in to the Arris Motorola SB6121 router by simply following some steps like launching your Internet Browser entering the right IP address of your modem and then redirecting to the login page to enter the user I'd and password, if in case the password is very weak then you can set up your password by filling the login detailsXfinitynity XB6  and then by following the steps you can change the password and then change the network name of the modem then finally secure the settings of Arris Motorola Cable Modem.

Here are Some Steps to Login into Arris Motorola SB6121 Router:

Step 1: Launch Your Internet Browser

Enter the IP address if the Arris router in the location bar of your internet browser. The IP address for this router is You can also type in the address bar of your web browser and then open the default gateway directly by pressing enter or clicking on the search icon.

Step 2: Enter User ID and Password

After typing in the right IP address of your modem, you will be redirected to the login page where you will be required to enter the username and password. In case this is your very first time operating the modem device, enter the default username and password.

Otherwise, take a look at the default credentials or box model. The username and password stated below are correct in most of the cases.

  • Motorola sb6121 Default username: Admin
  • Motorola sb6121 Default password: motorola

Step 3: Setup the Login Details of Xfinity XB6

The username and password are very easy to predict, therefore it is very much necessary for a person to secure the network by creating a new password. Therefore, it is advisable for one to change the password to keep it safe from unauthorized users.

Mentioned below are the tips that one must follow in order to change the username and password:

  • The password that you enter needs to be a mix of special characters and alphanumeric characters.
  • The username that you type in needs to be simple as well as user friendly.
  • The password that you type should have minimum 8 characters and maximum upto 16 characters.
  • You must write down the username and password of Arris Motorola cable modem at some place.

Step 4: Change the Network Name of the Modem

The wireless network names that you see under the network tab is called service set identifier or SSID. By default, the network name that appears on the list is the name of the brand manufacturer.

Therefore, you may see the network name as SB6121. It is also important for you to change the default name otherwise some unauthorized party may guess it and use your network.


  • The new network name that you create should be short and simple.
  • Don’t make it too strong that you can’t even remember it.
  • Don’t make use of any personal details for setting up the name of your modem.

Step 5: Secure the Settings of Arris Motorola Cable Modem

Under the default gateway, you will get to view the encryption settings of your network. You are required to setup the encryption according to the present industry standard, which is WPA2-PSK. It makes sure that your modem operates on the best possible security level.

So, these are the steps that you are required to carry out in order to log into Arris Motorola SB6121 router. In case you are encountering any issues while logging into the router, then you can contact the customer service associates to deal with the same.

  • Published by:  Marty   
  •  1 month ago