- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Public Zones
- Private Zones
- Record Sets
- PTR Records
- Intelligent Resolution
- Resolver
- Permissions Management
- Using CTS to Collect DNS Key Operations
- Access Logging
- Quota Adjustment
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- APIs
- Examples
- Permissions Policies and Supported Actions
- Appendix
- SDK Reference
-
FAQs
-
DNS Overview
- Will I Be Billed for the DNS Service?
- How Many Zones, PTR Records, and Record Sets Can I Create?
- What Are Huawei Cloud DNS Servers?
- What Are Huawei Cloud Private DNS Server Addresses?
- What Are the Differences Between Public and Private Domain Names?
- Does DNS Support IPv6?
- Does DNS Support Explicit Forwarding and Implicit Forwarding?
- Does DNS Support Dynamic Domain Name Resolution?
- Does DNS Support Wildcard Entries?
- What Is TTL?
- How Many Domain Name Levels Does DNS Support?
- How Are Zones Queried to Resolve a Domain Name?
- What Are the Priorities of Resolution Lines?
- Why Was the Email Address Format Changed in the SOA Record?
- What Is CAA?
- Why Should I Set Priority For an MX Record Set?
- Can DNS Point a Domain Name to a Specific Port?
- Invalid Domain Resolution
- Website Access Failures
-
Public Zones
- Why Is a Message Indicating Conflict with an Existing Record Set Displayed When I Add a Record Set?
- How Do I Handle the Conflict Between CNAME and MX Record Sets?
- How Do I Add Record Sets to Subdomains?
- Which IP Address Is Returned for the Domain Name If There Are Multiple IP Addresses in a Record Set?
- Can I Modify a Zone?
- Can DNS Translate a Domain Name to IP Addresses of On-premises Servers or Third-Party Servers?
- How Can Multiple Domain Names Be Linked to the Same Website?
- Configuring Weighted Routing
- Can DNS Resolve a Domain Name that Has Not Been Licensed?
- Does DNS Support Dynamic Domain Name Resolution?
- How Do I Change the DNS Servers of a Domain Name?
- How Do I Handle Inaccurate Scheduling Caused by the CNAME Record Set Cache in the Default Lines?
-
Private Zones
- Why Is a Message Indicating Conflict with an Existing Record Set Displayed When I Add a Record Set?
- How Do I Change Default DNS Servers of an ECS to Huawei Cloud Private DNS Servers?
- How Can I Access an ECS Using Its Host Name?
- How Can I Map the Private IP Address of an ECS to a Domain Name?
- How Can I Use a Private Domain Name to Route Internet Traffic?
- Can I Use Private Domain Names Across Regions?
- Do I Need to Register Private Domain Names?
- Will a Deleted VPC Be Automatically Disassociated from the Private Zone?
- Are Private DNS Server Addresses the Same for All Users?
- What Are the Restrictions on Concurrent Private DNS Queries?
- Reverse Resolution
- Domain Transfer
-
DNS Overview
- Videos
-
More Documents
-
User Guide (ME-Abu Dhabi Region)
- Overview
- Getting Started
- Private Zone
- Record Set
- PTR Record
- Permissions Management
- Key Operations Recorded by CTS
- Quota Adjustment
- FAQs
- Change History
- API Reference (ME-Abu Dhabi Region)
-
User Guide (Paris Region)
- Overview
- Getting Started
- Public Zones
- Private Zones
- Record Sets
- PTR Records
- Intelligent Resolution
- Permissions Management
- Key Operations Recorded by CTS
- Quota Adjustment
-
FAQ
-
DNS Overview
- Will I Be Billed for the DNS Service?
- How Many Zones, PTR Records, and Record Sets Can I Create?
- What Are DNS Servers?
- What Are the Differences Between Public and Private Domain Names?
- Does DNS Support IPv6?
- Does DNS Support Explicit and Implicit URLs?
- Does DNS Support Dynamic Domain Name Resolution?
- Does DNS Support Wildcard Entries?
- What Is TTL?
- How Many Domain Name Levels Does DNS Support?
- How Are Zones Queried to Resolve a Domain Name?
- Why Was the Email Address Format Changed in the SOA Record?
- What Is CAA?
- Why Should I Set Priority For an MX Record Set?
- Can DNS Point a Domain Name to a Specific Port?
-
Public Zones
- How Do I Add Record Sets to Subdomains?
- Which IP Address Is Returned for the Domain Name If There Are Multiple IP Addresses in a Record Set?
- What Can I Do If There Is Message Indicating that the Public Zone Already Exists?
- Can I Modify a Zone?
- How Can Multiple Domain Names Be Linked to the Same Website?
- Configuring Weighted Routing
-
Private Zones
- How Can I Map the Private IP Address of an ECS to a Domain Name?
- Can I Use Private Domain Names Across Regions?
- Do I Need to Register Private Domain Names?
- Will a Deleted VPC Be Automatically Disassociated from the Private Zone?
- Are Private DNS Server Addresses the Same for All Users?
- What Are the Restrictions on Concurrent Private DNS Requests?
- Reverse Resolution
-
DNS Overview
- Change History
- API Reference (Paris Region)
-
User Guide (Kuala Lumpur Region)
- Overview
- Getting Started
- Private Zone
- Record Set
- Permissions Management
- Key Operations Recorded by CTS
- Quota Adjustment
-
FAQs
-
DNS Overview
- Will I Be Billed for the DNS Service?
- How Many Zones and Record Sets Can I Create?
- What Are the Private DNS Servers Provided by the DNS Service?
- Does DNS Support Wildcard Entries?
- How Are Zones Queried to Resolve a Domain Name?
- Why Was the Email Address Format Changed in the SOA Record?
- Can DNS Point a Domain Name to a Specific Port?
- Private Zones
-
DNS Overview
- Change History
- API Reference (Kuala Lumpur Region)
- User Guide (Ankara Region)
- API Reference (Ankara Region)
-
User Guide (ME-Abu Dhabi Region)
- Glossary
- General Reference
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Translating an IP Address to a Domain Name
Scenarios
PTR records are used to prove credibility of IP addresses and domain names of email servers. To avoid being tracked, most spam senders use email servers whose IP addresses are dynamically allocated or not mapped to registered domain names. If you want to keep the spam out of your recipients' inbox, add a PTR record to map the email server IP address to a domain name. In this way, the email recipients can obtain the domain name by IP address and will know that the email server is trustworthy.
If you use an ECS as an email server, configure a PTR record to map the EIP of the ECS to the domain name.
This following are operations for you to add a PTR record for a cloud resource, such as ECS.
Preparations
Before configuring PTR records, you need to sign up for a HUAWEI ID and enable Huawei Cloud services, complete real-name authentication, top up your account, register a domain name with Huawei Cloud or a third-party domain name registrar, deploy an ECS, and bind an EIP to it.
- Sign up for a HUAWEI ID.
For details, see Sign up for a HUAWEI ID and enable Huawei Cloud services.
- Complete real-name authentication.
For details, see Real-Name Authentication.
If you have enabled Huawei Cloud services and completed real-name authentication, skip this step.
- Top up your account.
For details, see Topping up an Account.
Constraints
- You can only create PTR records for IP addresses with a 32-bit subnet mask.
- Only one PTR record can be created for an EIP.
- An EIP can be mapped to no more than 10 domain names.
Procedure
- Go to the PTR Records page.
- Click
on the upper left and select the desired region and project.
- Click Create PTR Record and configure the following parameters.
Retain the default values for other parameters. For details, see Creating a PTR Record.
Table 1 Parameters for creating a PTR record Parameter
Example Value
Description
EIP
XX.XX.XX.XX
EIP of another cloud resource, for example, an ECS.
You can select an EIP from the drop-down list.
Domain Name
example.com
Domain name mapped to the EIP.
TTL (s)
300
Cache duration of the PTR record, in seconds
Default value: 300
Tag
example_key1
example_value1
Tag that will be added to classify and identify the PTR record.
Description
The description of the PTR Record.
Supplementary information about the PTR record.
- Click OK.
You can view the created PTR record on the PTR Records page.
NOTE:
If a domain name is mapped to multiple EIPs, you must create a PTR record for each EIP.
- In the DOS window of your local PC that has been connected to the Internet, check whether the PTR record takes effect.
- Press Win+R to open the Run dialog box, enter cmd, and press Enter.
- Run the following command in the DOS window:
nslookup -qt=ptr [IP address]
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