ddns-rev-domainname
The ISC dhcp server has the "ddns-rev-domainname" keyword which allows one to override the default reverse dns domain.
This could be handy when working with delegations of address spaces below octet boundaries.
for example:
20.0.168.192.in-addr.arpa. CNAME 20.0-64.0.168.192.in-addr.arpa.
20.0-64.0.168.192.in-addr.arpa. PTR mypc.example.com.
From a question raised on Kea-users@lists.isc.org mailing list.
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