Reverse DNS

A reverse DNS (rDNS) maps a public IP address and a domain name. A reverse DNS lookup zone contains the attributes that instruct Cloud DNS to perform a Pointer (PTR) lookup against DNS servers to find the domain name mapped to the IPv4 or IPv6 addresses.

For more information about IPv6 configuration in the DCD, see IPv6 Configuration.

Prerequisites:

• You need an IONOS Cloud account with API credentials configured with the appropriate permissions.

• You must be a contract administrator, owner, or a user with Access and manage DNS privilege to create and manage PTR records. You can also set User privileges via the API.

• Before creating a Reverse DNS record, it is recommended to create an A or AAAA record for the IP address you want to use for the reverse DNS record. For more information, see Create a DNS Record.

• Sub-users can create Reverse DNS records for IPv4 addresses only if the user group they belong to has access to the concerned reserved IP block. For more information, see Add users to a group.

Note:

• Reverse DNS lookup is supported "only" for the following:

  • Public IPv6 addresses assigned to your VDCs.

  • Reserved IPv4 addresses.

• The IPv4 address must be from a reserved IP range. To reserve an IPv4 address, follow these steps: 1. In the DCD, go to Menu > Network Services > IP Management. 2. Enter a name and the number of IPv4 addresses. 3. Select a region where you want your IPv4 addresses to be reserved. 4. Select Reserve IP to reserve the IPv4 address. 5. Select OK to confirm the reservation.

• For a reverse DNS record, you can use an IPv6 address that belongs to any of the /56 IPv6 blocks assigned to the VDC and has a prefix length of /128. For example, consider the IPv6 address 2001:db8:1234:5678::1/128, which belongs to a 2001:db8:1234:5678::/56 block. For more information, see IPv6 Configuration.

Quick Links

Create PTR Records for Reverse DNS

Learn how to create PTR records for reverse DNS.

Update PTR Records

Learn how to update PTR records associated with reverse DNS.

View PTR Records

Learn how to view the list of PTR records.

Delete PTR records

Learn how to delete PTR records.