Comcast-7922 hostname for DS-Lite

Respectfully, I disagree with your answer and at the same time confuse by it too.

I must get an IP address assign by Comcast (DHCP?) server. Using a website like whatismyipaddress.com/, my public IP comes from COMCAST-7922. That said IP address is not static and therefore from time to time changes.

What I like to know in order to setup DS-Lite is the hostname of the server that is giving out the IP address. Somehow, when I plugged the modem to the wall, I got an IP address from Comcast without any input from me.

The information I'm seeking is not found within the settings of the cable modem.

@user_38fcd7 - I assumed that you have the Xfinity provided Gateway, could you please confirm if that is correct or if you are using your own Cable Modem or your own Combo Gateway?  if you are using the Combo Gateway (either from Xfinity or your own) the information you are looking for is available in the Admin pages of that device - under something like "Network WAN Connection" or something similar to that, both the IPv4 and IPv6 are listed if you are not using the Gateway in the Bridge mode. Perhaps if you could provide more detailed information of the setup (without any PI of course), this community could better understand it and provide an advice.

I use my own cable modem, specifically Netgear CM2050V and use Unifi UDR for routing/switching/Wi-Fi. The information I am looking for IS NOT available from the admin pages from any device (i.e. cable modem router) that I own, it comes from the ISP provider! What your suggesting can be ascertain from an "Admin page" is the same info I can get using a website like "whatismyipaddress.com" which I already mention in my previous reply. The best hostname information I have found so far is c-MyIP.hsd1.nj.comcast.net, where "MyIP" is the ip address given to me from Comcast. The only problem with what I found so far is the "MyIP"

changes because I don't have a static IP. 

I will try to explain by using an example.

I use Cloudflare for DNS. In order to set it up via my router (not cable modem). I enter the IPv6 address to the server that provides the DNS service, specifically 2606:4700:4700::112 and the backup 2606:4700:4700::1002.

Similarly, if I want DNS over TLS (DoT), I enter the following hostname into the client device or router

                                  security.cloudflare-dns.com

Using the above example and following from the original post:

Ubiquity implemented DS-Lite support on their UDR router. As part of the setup, I get the following instructions from the UDR router:

"Enter the IPv6 address or hostname of your upstream gateway, typically provided by your ISP."

Does anyone know the hostname/ IPV6 address for COMCAST-7922.

I used something better... "whatismyipaddress.com".... the ipconfig /all will not give the information that I am seeking.

Happy to help take a closer look, @user_38fcd7. Can you please send a direct chat message with your full name and complete service address to “Xfinity Support”? To do so, click on the chat icon located at the top right of this forum's page.
 
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Hello @jc135! Thank you for taking the time to reach out to us. Please send us a direct message with your first/last name and full address. You can start by clicking the "direct message" icon on the upper right page of the forum page. Once you click on that, input our shared handle "Xfinity Support" to send us a direct message. If you're signed in to your forums profile and because you have already posted to the public page, you should have the option to do so.