Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) Login
The Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) is a modem-router (gateway) whose admin page answers on 10.0.0.1. Each unit has its own admin password printed on the device label — there is no shared default.
10.0.0.1 Login
Login address: 10.0.0.1
Username / password: admin / On the label (unique)
Contents
Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) default login
| Model | Login address | Username | Password | Source |
|---|---|---|---|---|
| xFi Gateway XB8 (CGM4981COM) | 10.0.0.1 | admin | On the label (unique) | Official doc |
Checked against Xfinity Support — Change your WiFi with the Gateway Admin Tool on 31 Aug 2026 (medium confidence), via the ssid.ai dataset (CC BY 4.0).
“No admin/admin or admin/password default on the XB8.”
How to log in to the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)
- Connect to the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) by Wi-Fi or a network cable. On a phone, turn off mobile data.
- Open a browser and go to 10.0.0.1.
- Sign in with admin / On the label (unique).
- Open the Wireless or Wi-Fi section to change the network name and password.
If the login does not work
- Check the label first. This model has a unique password printed on the device — admin / admin will not work.
- Someone may have changed it. A factory reset restores the login above.
- Reset: hold the Reset button for about 10 seconds while the device is powered on.
- Wrong address? Check your default gateway — see how to find your router’s IP.
- Type
http://, not https://, and turn off any VPN or Private DNS.
Other Xfinity (Comcast) models
| Model | Login address | Username | Password | Source |
|---|---|---|---|---|
| Xfinity Advanced Gateway XB10 | App only | — | App only (no web login) | Official doc |
| xFi Gateway XB7 (CGM4331COM) | 10.0.0.1 | admin | On the label (unique) | Official doc |
More help
Frequently asked questions
What is the default password for the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)?
Username admin, password On the label (unique).
What is the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) IP address?
The admin page is at 10.0.0.1.
How do I reset the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)?
Hold the Reset button for about 10 seconds while the device is powered on.