Reverse DNS records permit the lookup of the host name corresponding to an ip address. Direct management of the mapping of host names to ip addresses requires that control of the reverse zone be delegated to the managing party.
The two forms of delegation are standard delegation on a standard subnet boundary and classless delegation by means of CNAME records. (see rfc 3172) edgedirector name servers can handle both types of delegation as long as the correct delegated zone name is specified.
In either type of delegation, the records are kept in a separate dns zone ending in in-addr.arpa.
zone name examples
zone name for standard delegation of 192.168.100.0/24 100.168.192.in-addr.arpa zone name for classless delegation of 192.168.100.64/26 subnet prefix using '/' 64/18.104.22.168.in-addr.arpa subnet prefix using '-' 64-22.214.171.124.in-addr.arpa ip range 64-127.100.168.192.in-addr.arpa ip start 126.96.36.199.in-addr.arpa
edgedirector servers are compatible with reverse dns PTR records in the in-addr.arpa zone for ipv4 or the ip6.arpa zone for ipv6. Clients who have PTR record requirements will need to contact support to have the zones setup in their accounts prior to use.