All ISPs receiving /16 prefix blocks from the InterNIC will be responsible
for maintaining all IN-ADDR.ARPA domain records for their respective
customers. The InterNIC Registry will only be responsible for the
maintenance of IN-ADDR.ARPA domain records for those CIDR blocks with
prefixes longer than /16 issued directly from the InterNIC.
I think you mean shorter, as in:
The InterNIC Registry will only be responsible for the
maintenance of IN-ADDR.ARPA domain records for those CIDR blocks with
prefixes SHORTER than /16 issued directly from the InterNIC.
--bill