Yes, the extender can be used with COMCAST, which is what I used it for. I have a poor quality cable modem/router combo unit from COMCAST that had a wifi range of about 5 feet. I used this extender to get wifi to the other floors of my 2 story house and into my basement. It was successful in doing that. I do have some connection issues with some devices, and some bandwidth issues, but I believe that is caused by the COMCAST device.