What is the default password for Xfinity (Comcast) routers?

Xfinity (Comcast) routers have no universal default password. All 2 Xfinity (Comcast) models we track either make you set a password during first setup, print a password unique to your unit on the device label, or are managed only from the app — so there is no shared password to look up. Open your exact model below for its cited login.

What is the default IP address for Xfinity (Comcast) routers?

Every Xfinity (Comcast) model we track with a documented admin address uses 10.0.0.1. Open http://10.0.0.1 in a browser on the router's own network.

Which Xfinity (Comcast) routers still ship a default password?

None of the 2 Xfinity (Comcast) models we track ship a universal default password — each one either forces a password at setup, prints a unique password on the device label, or is app-managed only.

Xfinity (Comcast) router default passwords & logins

None of the 2 Xfinity (Comcast) models we track ship a universal default password. Every default below is cited to Xfinity (Comcast)'s own documentation.

xFi Gateway XB7 (CGM4331COM)xFi Gateway XB8 (CGM4981COM)

FAQ

What is the default password for Xfinity (Comcast) routers?: Xfinity (Comcast) routers have no universal default password. All 2 Xfinity (Comcast) models we track either make you set a password during first setup, print a password unique to your unit on the device label, or are managed only from the app — so there is no shared password to look up. Open your exact model below for its cited login.
What is the default IP address for Xfinity (Comcast) routers?: Every Xfinity (Comcast) model we track with a documented admin address uses 10.0.0.1. Open http://10.0.0.1 in a browser on the router's own network.
Which Xfinity (Comcast) routers still ship a default password?: None of the 2 Xfinity (Comcast) models we track ship a universal default password — each one either forces a password at setup, prints a unique password on the device label, or is app-managed only.

Xfinity (Comcast) credential history (2)

Every addition, credential change, or removal we've recorded for Xfinity (Comcast)models, oldest first — the record IEEE-style public registries don't keep for router manufacturers.

2026-07-13 Added to the directory — Xfinity (Comcast) xFi Gateway XB7 (CGM4331COM) (label-unique)
2026-07-13 Added to the directory — Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) (label-unique)

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