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Look here for supported modems https://mydeviceinfo.xfinity.com/
I wouldnt point people outside of a xfinity\comcast site due to the fact you dont know how much it is updated or if it is updated.. The https://mydeviceinfo.xfinity.com/ site is updated when a new modem gets approved\new servcies are added or when a device is EOL.. So it should always be up-2-date..