Hello
Is there anyway in Linux (Debian, Centos) to find out all routed ipv6 ranges?
"ip -6 route show" should show you the IPv6 route table on most flavors of Linux.
Is that what you are looking for? I mean technically the entire IPv6 address space is routed by your default route of "::/0" to whatever your IPv6 gateway is.
So anything that isn't handled by a more specific route (static route, connected network, funny IPtables rules, ect...) will be routed to the gateway.