We are looking to add rdns records for our IPV6 blocks located at redstation/iomart however they advised us they do not handle RDNS requests due to the large number of IP's and that we should find a company to manage these for us and they can transfer the block over.
Does anyone know of such company that can do this either free or paid?
And probably a bunch of others.
Create your own zone for the ipv6 rdns, then you can manage it yourself. The provider just needs to delegate the zone (ip6.arpa subdomain) to the name servers you choose.