RDS provides two types of addresses: intranet addresses and Internet addresses.

Intranet and Internet addresses

Address Type Description
Intranet address

The intranet address is generated by default.

Use the intranet address if all of the following conditions are met:

  • Your application is deployed on an ECS instance.
  • The ECS instance is located in the same region as your RDS instance.
  • The ECS instance has the same network type as your RDS instance.
The intranet address is recommended because accessing RDS through the intranet is most secure and delivers optimal performance.
Internet address You need to manually apply for the Internet address. You can also release it anytime.

Use the Internet address if you cannot access RDS through the intranet. Specific scenarios are as follows:

  • An ECS instance accesses your RDS instance but the ECS instance is located in a different region or has a network type different from your RDS instance.
  • A server or computer outside Alibaba Cloud accesses your RDS instance.
  • The Internet address and traffic are currently free of charge.
  • Using the Internet address reduces security. Please exercise caution.
  • To ensure high security and performance, we recommend that you migrate your application to an ECS instance that is in the same region and has the same network type as your RDS instance and then use the intranet address.

Apply for an Internet address

  1. Log on to the RDS console.
  2. In the upper-left corner, select the region where the RDS instance is located.
  3. Find the RDS instance and click its ID.
  4. In the left-side navigation pane, click Database Connection.
  5. Click Apply for Public Endpoint.

  6. In the displayed dialog box, click OK.

    The Internet address is generated.

  7. Optional. To modify the Internet address or port number, click Change Endpoint. In the displayed dialog box, select a connection type, set the Internet address and port number, and click OK.
    • Connection Type: Select Public Endpoint.
      Note The Public Endpoint option is available only after you have applied for the Internet address.
    • Endpoint: The address contains 8 to 64 characters, including letters, digits, and hyphens (-). The address prefix must start with a lowercase letter.
    • Port: The port number can be modified only when the RDS network type is classic network.


API Description
AllocateInstancePublicConnection Used to apply for an Internet address.