My ISP Ziggo only supports IPv6 if I use their crummy CPE device. I want to use my own router, so no IPv6 for me. Does Ziggo support IPv6? This is one example

My ISP Ziggo only supports IPv6 if I use their crummy CPE device. I want to use my own router, so no IPv6 for me. Does Ziggo support IPv6? This is one example, but there are many where we need to investigate more than just, "Does my ISP support IPv6?"