How Can I Map the Private IP Address of an ECS to a Domain Name?
You can configure PTR records to allow end users to query domain names based on IP addresses.
To map the private IP address of an ECS to a domain name, you must create a private zone and add a PTR record to the zone.
To add a PTR record, you may refer to Creating a PTR Record.
![](https://support.huaweicloud.com/eu/dns_faq/public_sys-resources/note_3.0-en-us.png)
The domain name for the PTR record must be in the x.x.x.x.in-addr.arpa format. in-addr.arpa is the domain name suffix used for reverse resolution.
For example, if the private IP address is 192.168.1.10, the domain name is 10.1.168.192.in-addr.arpa.
You need to create a private zone with the domain name set to 192.in-addr.arpa and add a PTR record with the Name field set to 10.1.168.
Creating a Private Zone
- Go to the Private Zones page.
- Click Create Private Zone.
- Configure the parameters based on Table 1.
Table 1 Parameters for creating a private zone Parameter
Description
Example Value
Domain Name
Domain name you use to access the cloud servers or cloud services.
Ensure that the domain name suffix is in-addr.arpa.
192.in-addr.arpa
VPC
VPC to be associated with the private zone.
Select the VPC you want to associate with the private zone.
N/A
Email
(Optional) Email address of the administrator managing the private zone.
Recommended email address: HOSTMASTER@Domain name
For more information about the email address, see Why Was the Email Address Format Changed in the SOA Record?
HOSTMASTER@example.com
Enterprise Project
Enterprise project associated with the private zone.
You can manage private zones by enterprise project.
NOTE:This parameter is available and mandatory only when Account Type is set to Enterprise Account.
When setting this parameter, note the following:
- If you do not manage zones by enterprise project, select the default enterprise project.
- If you manage zones by enterprise project, select an existing enterprise project.
Before you set this parameter, create an enterprise project.
default
Tag
(Optional) Identifier of a resource
Each tag contains a key and a value. You can add a maximum of 10 tags to a zone.
For details about tag key and value requirements, see Table 2.
example_key1
example_value1
Description
(Optional)
Supplementary information about the zone
You can enter a maximum of 255 characters.
This is a private zone.
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.
- Cannot start or end with a space nor contain special characters =*<>\,|/
example_key1
Value
- Cannot be left blank.
- Can contain a maximum of 43 characters.
- Cannot start or end with a space nor contain special characters =*<>\,|/
example_value1
- Click OK.
- Switch back to the Private Zones page.
You can view the created private zone in the private zone list.
Click the domain name to view SOA and NS record sets automatically generated for the zone.
- The SOA record set identifies the primary authoritative server for the domain name.
- The NS record set defines the authoritative DNS servers for the domain name.
Adding a PTR Record
- On the Private Zones page, click the domain name of the private zone you created.
The Record Sets page is displayed.
- Click Add Record Set.
The Add Record Set dialog box is displayed.
- Configure the parameters based on Table 3.
Table 3 Parameters for adding a PTR record Parameter
Description
Example Value
Name
Part of the private IP address in reverse order.
10.1.168
For example, if the IP address is 192.168.1.10, the domain name in the PTR record must be 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.
PTR – Map IP addresses to domains
TTL (s)
Cache duration of the record set, in seconds.
Default value: 300
Value
Domain name mapped to the IP address.
You can enter only one name.
mail.example.com
Tag
(Optional) Identifier of a resource. Each tag contains a key and a value. You can add 10 tags at most to a record set.
For details about tag key and value requirements, see Table 2.
example_key1
example_value1
Description
(Optional) Supplementary information about the PTR record set.
This parameter is displayed when you expand More Settings.
The PTR record is for reverse resolution.
- Click OK.
- Switch back to the Record Sets tab.
The added record set is in the Normal state.
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