# Adding a PTR Record

#### Scenarios

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

For details about other record set types, see Overview.

#### Constraints

- You can create PTR records only in private zones.
- PTR records take effect only in a private zone whose domain name suffix is in-addr.arpa.

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

#### Procedure

1. Log in to the management console.
2. In the service list, choose Network > Domain Name Service.

   The DNS console is displayed.

3. In the navigation pane, choose Private Zones.

   The Private Zones page is displayed.

4. Click in the upper left corner and select the desired region and project.
5. Click the zone name.
6. Click Add Record Set.

   The Add Record Set dialog box is displayed.

7. Set required parameters based on Table 1.

   Table 1 Parameters for adding a PTR record
   Parameter | Description | Example Value
   --- | --- | ---

   Name

   Name of the PTR record

   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 private zone name is 192.in-addr.arpa, enter 10.1.168 in the box.
   - If the private zone name is 1.168.192.in-addr.arpa, enter 10 in the box.

   Type | Type of the record set If a message is displayed indicating that the record set you are trying to create exists, the record set conflicts with an existing 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 is 300. If your service address changes frequently, set TTL to a smaller value. | The default value is 300, which is, 5 minutes.
   Value | Private domain name mapped to the private IP address. You can enter only one domain name. | host.example.com.
   Tags | (Optional) Identifier of a resource Each tag contains a key and a value. You can add a maximum of 20 tags to a record set. This parameter is displayed when you enable Other Settings. For details about tag key and value requirements, see Table 2. | example_key1 example_value1
   Description | (Optional) Supplementary information about the record set You can enter a maximum of 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 a maximum of 36 characters.

   example_key1

   Value

   - Cannot be left blank.
   - Can contain a maximum of 43 characters.

   example_value1

8. Click OK.
9. Switch back to the Record Sets page.

   View the added record set in the record set list of the zone and ensure that the status of the record set is Normal.

#### 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?

Parent topic: Adding Record Sets