New Policy and Procedures for Reverse DNS Requests
The RIPE NCC has implemented a number of changes in the policy and procedures for requesting reverse delegation. This follows the effort to streamline reverse DNS operations  and make it easier for network administrators to manipulate related domain objects.
You should be aware of the following changes:
When users want to update their reverse DNS information, they send an e-mail to <auto-dbm _at_ ripe _dot_ net> (formerly this mail was sent to <auto-inaddr _at_ ripe _dot_ net>). The database update program will verify the DNS information and update the RIPE Database. The information will appear in the DNS after a short delay.
The policy constraints have been reduced. Previously only space assigned to End Users could be reverse delegated in DNS. This caused administrative burden to LIRs, as every time space was assigned, reverse DNS had to be set up for that space. Now reverse DNS can be set up for an entire allocation.
Documentation that details the new setup and authorisation can be found at:
More details on these developments is provided below.
* The reverse DNS policy as proposed in  is published as ripe-302.
The main change to the policy is the removal of the requirement for valid assignments.
Reverse delegations can also be requested by non LIRs if an appropriate "mnt-domains:" attribute is in place in the corresponding inetnum/inet6num object, when submitting requests to <auto-dbm _at_ ripe _dot_ net>.
* The <auto-inaddr _at_ ripe _dot_ net> interface will be deprecated as of 1 July 2004.
To allow for a graceful transition, the "mnt-domains:" based authorisation mechanism has not been implemented for the <auto-inaddr _at_ ripe _dot_ net> interface. This will continue to use reg ID
The "mnt-by:" attribute will become mandatory. However, the existence of the "mnt-by:" attribute in domain objects is not enforced when the object is submitted through the <auto-inaddr _at_ ripe _dot_ net> interface.
Please contact ripe-dbm _at_ ripe _dot_ net if you have further questions.
 Original RDNS Project Proposal
 "mnt-domains:" Attribute Proposal
 Policy for Reverse Address Delegation of IPv4 and IPv6 Address
Space in the RIPE NCC Service Region