Second IP address

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;

https://www.xfinity.com/support/rate-card/

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.

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 !

Oh wait I see the pdf theres nothing that lists IP addresses.

Why do you need a 2nd IP address for a non-commercial hookup? 

Do note that you get a vast number of IPv6 addresses (called a /64, which gives you 2^64 addresses). Only IPv4 addresses are in short supply.

It says Your local Comcast service rate information is available. Is there another way I can get it?

@EG For IPv6, there's no difference between LAN and WAN addresses, because there's no network address translation (NAT) as there is with IPv4. All your IPv6 addresses are public. That's why you need a good firewall when using IPv6. You can't depend on NAT to protect you from probes from the Internet. On the plus side, you no longer need hacks like port forwarding to expose games, telephony, video conferencing, or P2P services to the world. You just need to open those ports on the firewall.

Hi @uyyalada! 

Welcome to the Xfinity Forums. @EG is correct. The option to have a second IP Address is being phased out, but I'd be happy to determine if this is still available to you. Please send me a private message with your full name, as it appears on your billing statement. To send a message, click on my name "ComcastChe," then click "send a message. 

They asked this: (quote) "how much would a external IP address cost."

Seems that they want an additional external / public / WAN IP address ?

There is a difference between external / public / WAN IP addresses and the internal / private / LAN IP addresses that you described as being (quote) "a vast number of IPv6 addresses."

The LAN IPv6 addresses are privately assigned to the individual network clients. There is no additional charge for private IP's. You can't directly compare these.

They seem to want an additional public / WAN IP. These types of requests that are made here are typically for activating a second ethernet port on a straight cable modem (not a combo gateway device) such as the Moto SB8200. We shall see.

The IPv6 addresses are privately assigned but publicly addressable. If you publish your assignment of one of your addresses and open it in your firewall, I can reach it. That's one of the big features of IPv6. No more NAT complications that require the port forwarding hack. It does exactly the same thing as additional IPv4 addresses, except that you decide which ones to publish.

How you assign your address block is up to your router. A default Comcast router setup will just hand them out randomly via DHCP. But you can use static assignments, too. 

Thanks but your telling me stuff that I already know. We are going off on a tangent / off topic / splitting hairs here to the original poster. Apologies to the OP. 🙂

@EGCan you get another employee @ComcastChe isnt repiying to my messages.

Will try re-escalating.

Hey, @uyyalada ! I hope you are doing well and apologize for the delay in response. I do see your PM and will continue to assist you through there. We certainly appreciate your patience!

Trying to send one of you Comcast employees a PM about this, but I’m not given an option to anywhere on your profile when I click your name. 
@ComcastMichael @ComcastChe