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Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) default password & login IP

The Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) ships with a unique password printed on the device label, not a shared default — log in at http://10.0.0.1.

For regaining access to a router you own or administer. If you didn't set it up, ask whoever did.
Login address
http://10.0.0.1
Gateway IP
10.0.0.1
Username
admin
Password
— on the device label —

The password is unique to your unit and printed on a sticker on the router (often labelled Password or Access Key).

No admin/admin or admin/password default on the XB8. The label carries a unique admin password, and web admin access often has to be toggled on from the Xfinity app first because WiFi Intelligence locks the local tool.

Factory reset

Browse to http://10.0.0.1 and sign in with username 'admin'. If the page won't load, enable it first in the Xfinity app: WiFi > View WiFi equipment > Advanced Settings > Admin Tool online access > ON. The default Admin Tool password is the unique string on the label on the bottom of the XB8 (not 'password'). Factory reset: hold the recessed Reset pinhole on the rear ~30 seconds until it reboots; log back in with the label credentials.

More Xfinity (Comcast) models

Source: Xfinity Support — Change your WiFi with the Gateway Admin Toolverified · medium confidence · updated 2026-09-07

FAQ

What is the default password for the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)?
The Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) ships with a unique password printed on the device label, not a shared default — log in at http://10.0.0.1.
What is the default login IP for the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)?
The Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) default login IP is 10.0.0.1 — open http://10.0.0.1 in a browser on the router's own network.
What is the default username for the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)?
The Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM) default admin username is admin. The matching password is unique to your unit and printed on the sticker on the router.
How do I factory-reset the Xfinity (Comcast) xFi Gateway XB8 (CGM4981COM)?
Browse to http://10.0.0.1 and sign in with username 'admin'. If the page won't load, enable it first in the Xfinity app: WiFi > View WiFi equipment > Advanced Settings > Admin Tool online access > ON. The default Admin Tool password is the unique string on the label on the bottom of the XB8 (not 'password'). Factory reset: hold the recessed Reset pinhole on the rear ~30 seconds until it reboots; log back in with the label credentials.

Verification history (56)

Every time we've checked this model's default credentials, oldest first — including when nothing changed. Absence of change over time is itself the evidence.

  1. 2026-07-13First verified· label-unique
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  2. 2026-07-14Re-verified, unchanged· label-unique
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  3. 2026-07-14Re-verified, unchanged· label-unique
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  4. 2026-07-15Re-verified, unchanged· label-unique
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  5. 2026-07-20Re-verified, unchanged· label-unique
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  6. 2026-07-27Re-verified, unchanged· label-unique
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  7. 2026-07-27Re-verified, unchanged· label-unique
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  8. 2026-07-27Re-verified, unchanged· label-unique
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  9. 2026-07-27Re-verified, unchanged· label-unique
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  10. 2026-07-27Re-verified, unchanged· label-unique
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  11. 2026-07-27Re-verified, unchanged· label-unique
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  12. 2026-07-27Re-verified, unchanged· label-unique
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  13. 2026-07-27Re-verified, unchanged· label-unique
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  14. 2026-07-27Re-verified, unchanged· label-unique
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  15. 2026-07-27Re-verified, unchanged· label-unique
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  16. 2026-07-28Re-verified, unchanged· label-unique
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  17. 2026-07-28Re-verified, unchanged· label-unique
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  18. 2026-07-29Re-verified, unchanged· label-unique
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  19. 2026-07-29Re-verified, unchanged· label-unique
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  20. 2026-07-29Re-verified, unchanged· label-unique
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  21. 2026-07-29Re-verified, unchanged· label-unique
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  22. 2026-07-29Re-verified, unchanged· label-unique
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  23. 2026-07-30Re-verified, unchanged· label-unique
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  24. 2026-07-30Re-verified, unchanged· label-unique
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  25. 2026-07-30Re-verified, unchanged· label-unique
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  26. 2026-07-30Re-verified, unchanged· label-unique
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  27. 2026-07-30Re-verified, unchanged· label-unique
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  28. 2026-07-31Re-verified, unchanged· label-unique
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  29. 2026-08-02Re-verified, unchanged· label-unique
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  30. 2026-08-04Re-verified, unchanged· label-unique
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  31. 2026-08-04Re-verified, unchanged· label-unique
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  32. 2026-08-07Re-verified, unchanged· label-unique
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  33. 2026-08-08Re-verified, unchanged· label-unique
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  34. 2026-08-09Re-verified, unchanged· label-unique
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  35. 2026-08-10Re-verified, unchanged· label-unique
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  36. 2026-08-10Re-verified, unchanged· label-unique
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  37. 2026-08-10Re-verified, unchanged· label-unique
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  38. 2026-08-10Re-verified, unchanged· label-unique
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  39. 2026-08-10Re-verified, unchanged· label-unique
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  40. 2026-08-10Re-verified, unchanged· label-unique
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  41. 2026-08-12Re-verified, unchanged· label-unique
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  42. 2026-08-12Re-verified, unchanged· label-unique
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  43. 2026-08-16Re-verified, unchanged· label-unique
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  44. 2026-08-17Re-verified, unchanged· label-unique
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  45. 2026-08-17Re-verified, unchanged· label-unique
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  46. 2026-08-17Re-verified, unchanged· label-unique
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  47. 2026-08-24Re-verified, unchanged· label-unique
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  48. 2026-08-24Re-verified, unchanged· label-unique
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  49. 2026-08-27Re-verified, unchanged· label-unique
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  50. 2026-08-31Re-verified, unchanged· label-unique
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  51. 2026-08-31Re-verified, unchanged· label-unique
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  52. 2026-09-04Re-verified, unchanged· label-unique
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  53. 2026-09-04Re-verified, unchanged· label-unique
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  54. 2026-09-06Re-verified, unchanged· label-unique
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  55. 2026-09-06Re-verified, unchanged· label-unique
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  56. 2026-09-07Re-verified, unchanged· label-unique
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