I have a personally procured cable modem by ARRIS that supports a second IP address when the ISP provides this.
I was just on the phone for 2 hrs 15 minutes with technical support and they sent me a thread to get an answer. I am starting my own thread at the recommendation of the Comcast employee.
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They are phasing it out but I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. We've seen cases here where they have been able to get this accomplished for customers even when it is not listed in their rate cards, YMMV. You should get a reply here in your topic. Good luck !
Hi Mariel19. Thanks for posting on our Forum. I can assist with reviewing your account and the available 2nd dynamic IP address options. Please reach out to me via private message and include your full name and service address so I can assist you.