First, check the "Rate Card" for your local area to see if that feature is even available anymore. Seems that it is being phased out;
It's a PDF.
Scroll down to "Xfinity Internet" and look for "Additional IP Addresses".
If nothing is listed then it's likely to have been discontinued in your local market area.
Hi aknewhope15. We appreciate you visiting and posting on our Forums. I can assist with reviewing your account to determine if we offer 2nd dynamic IP addresses in your area. I received your private message and have responded. Let's continue via PM please.