Adding a PTR Record Set

Scenarios

You can create PTR record sets to map private IP addresses to domain names.

For more information about each type of record sets, see Record Set Types and Configuration Rules.

Constraints

• You can create PTR record sets only in private zones.
• PTR record sets can only be added to private zones whose domain name suffix is in-addr.arpa.

  For details about how to create a PTR record for a public domain name, see Creating a PTR Record.

Procedure

1. Go to the Private Zones page.
2. Click on the upper left and select the desired region and project.
3. Locate the zone and click Manage Record Set in the Operation column.
4. Click Add Record Set.

   The Add Record Set dialog box is displayed.

5. Configure the parameters based on Table 1.

   Table 1 Parameters for adding a PTR record set

   Parameter	Description	Example Value
   Name	Name of the PTR record set	10.1.168 For example, if the IP address is 192.168.1.10, the domain name in the PTR record is 10.1.168.192.in-addr.arpa. If the domain name is 192.in-addr.arpa, enter 10.1.168. If the domain name is 1.168.192.in-addr.arpa, enter 10.
   Type	Type of the record set A message may be displayed indicating that the record set you are trying to add conflicts with an existing record set. For details, see Why Is a Message Indicating Conflict with an Existing Record Set Displayed When I Add a Record Set?	PTR – Map IP addresses to domains
   TTL (s)	Cache duration of the record set on a local DNS server, in seconds. The value ranges from 1 to 2147483647, and the default value is 300. If your service address changes frequently, set TTL to a smaller value. Learn more about TTL.	300
   Value	Private domain name mapped to the private IP address. You can enter only one domain name.	host.example.com.
   Tag	(Optional) Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags to a record set. For details about tag key and value requirements, see Table 2. NOTE: If you have configured tag policies for DNS, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	(Optional) Supplementary information about the record set. The description can contain no more than 255 characters.	-

   Table 2 Tag key and value requirements

   Parameter	Requirements	Example Value
   Key	Cannot be left blank. Must be unique for each resource. Can contain no more than 36 characters. Cannot start or end with a space nor contain special characters =*<>\,|/	example_key1
   Value	Cannot be left blank. Can contain no more than 43 characters. Cannot start or end with a space nor contain special characters =*<>\,|/	example_value1

6. Click OK.
7. Switch back to the Record Sets tab.

   The added record set is in the Normal state.

Related Operations

For more information, see How Can I Configure a PTR Record to Map the IP Address of an ECS to a Domain Name?