Reverse Zone Delegation

[Jason Granat]

I am running BIND 8.2.2 on IRIX 6.5.  My nameservers answer forward and
reverse queries, however, when a nameserver outside my domain is queried
forward resolution is correct but reverse does not work.  Delegation
seems to still be with my upline provider.  With what entity does
reverse delegation need to be registered? NSI only handles forward as
far as I understand. Is it an ARIN thing?

Please help,

Jason