RIPE and DNS delegations for provider independent addresses

In case "companyA" has /24 provider independent network allocated by
RIPE, which has RIPE NCC as a first maintainer and "companyA"
maintainer object as a second maintainer, then is "companyA" able to
delegate reverse DNS queries to the DNS server it prefers? Or should
"companyA" contact RIPE NCC in order to get reverse
delegation(http://www.ripe.net/data-tools/dns/reverse-dns) done?
In addition, if I know the provider independent IP address, then is it
possible to view the delegated DNS server using the whois.ripe.net
database? So far I have used "dig +trace -x I.I.P.P" and followed the
chain of delegations.


regards,
martin