Yes, it will but know this. The WiFi electronics built into the Comcast or Xfinity router is very weak to start with. So that signal is not great and what I did was connect this NetGear AC750 in my upstairs so it could extend the weak signal from the Comcast router. If you are not sure of what I am saying Google Comcast Wifi router and see what is being said out there about these devices. I went to Comcast and got their newest model and still the WiFi is very weak unless you are in close proximity to the device.
Good Luck....