- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Public Zones
- Private Zones
- Record Sets
- PTR Records
- Intelligent Resolution
- Permissions Management
- Using CTS to Collect DNS Key Operations
- Quota Adjustment
- Change History
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- APIs
- Examples
- Permissions Policies and Supported Actions
- Appendix
- Best Practices
-
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 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?
- 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 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?
- How Do I View and Change the DNS Servers of a Domain Name?
-
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 Requests?
- Reverse Resolution
- Domain Transfer
-
DNS Overview
Show all
What Is Reverse Resolution?
Generally, DNS resolves a domain name to an IP address. When you access a website using a domain name, DNS maps the domain name to the IP address of the web server where the website is deployed.
Reverse resolution, on the opposite, is a query in which a domain name connected with an IP address is returned. It is usually used in scenarios such as anti-spam and logging.
- Anti-spam: queries the domain name based on the IP address of the sender's mail server to obtain the reputation of the domain name.
- Logging: queries the domain name or host name based on the IP address to distinguish service data.
To obtain a domain name from a private IP address, you need to create a private zone for top-level domain in-addr.arpa. For example, if the IP address 192.0.2.255, the domain name for the PTR record can be 255.2.0.192.in-addr.arpa.
By default, each EIP supports reverse resolution, and its domain name for the PTR record is in the format of ecs-x-x-x-x.compute.hwclouds-dns.com. By pinging each EIP, you can obtain its default domain name. You can create a PTR record for the EIP to overwrite the default domain name.
Feedback
Was this page helpful?
Provide feedbackThank you very much for your feedback. We will continue working to improve the documentation.