If you can use something, it's useful. Useful things are handy for whatever you're doing. If something is just what you need or you just find it helpful, then it's useful. A hammer is useful in building many things. Coasters are useful if you don't want a coffee table to get stains. College degrees are useful â or necessary â for many careers.
Where is the security key on a comcast modem located? The security key on a Comcast Modem is located next to the serial  number of the unit. Sometimes the serial number is the number used  as a security code if it is not printeâ¦d on the device. (MORE) 1 person found this useful.
1. Re: Anyone have the Comcast router/gateway. You have to call Comcast and tell them you want their modem to act like a modem, because you have your own router. They will do some magic while your own the phone, and tell you only one device can be connected to the modem. There you go, one public IP. Like Show 0 Likes (0)