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.
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 a2001:db8:1234:5678::/56
block. For more information, see IPv6 Configuration.
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