Help Center> Domain Name Service> User Guide> Record Sets> Configuring a Wildcard DNS Record Set
Updated on 2024-01-04 GMT+08:00

Configuring a Wildcard DNS Record Set

Scenarios

A wildcard record set with its name set to an asterisk (*) can map all subdomains of the domain name to the same value. During domain name resolution, fuzzy match is used.

Exact match has a higher priority than fuzzy match.

Constraints

Wildcard DNS resolution does not support NS and SOA record sets.

Procedure

  1. Go to the DNS console.
  2. In the navigation pane, choose Public Zones or Private Zones.

    The zone list is displayed.

  3. (Optional) If you have selected Private Zones, click on the upper left corner to select the region and project.
  1. Click the name of the zone to which you want to add a wildcard DNS record set.
  2. Click Add Record Set.
  3. Configure the parameters based on Table 1.
    Table 1 Parameters for adding a wildcard DNS record set

    Parameter

    Description

    Example Value

    Name

    Public (or private) domain name

    Enter an asterisk (*) as the leftmost label of the domain name, for example, *.example.com.

    NOTE:

    Only the leftmost asterisk is considered as a wildcard character. Other asterisks in the domain name are common text characters.

    *.abc

    Type

    Record set type

    Wildcard DNS resolution does not support NS and SOA record sets.

    A – Map domains to IPv4 addresses

    Line

    The DNS server will return the IP address of the specific line, depending on where the visitors come from.

    This parameter is only designated for public domain names.

    • Default: returns the default resolution result irrespective of where the visitors come from.
    • ISP: returns the resolution result based on visitors' carrier networks. For details, see Configuring ISP Lines.
    • Region: returns the resolution result based on visitors' geographical locations. For details, see Configuring Region Lines.

    Default

    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.

    Learn more about TTL.

    300

    Value

    Record set value

    Take an A record set for example, Value is set to IPv4 addresses mapped to the domain name. Example:

    192.168.12.2

    192.168.12.3

    Weight

    (Optional) Weight of a record set. The value ranges from 0 to 1000, and the default value is 1.

    This parameter is only designated for public domain names.

    If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.

    1

    Tag

    (Optional) Identifier of a record set. Each tag contains a key and a value. You can add a maximum of 10 tags 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 record set.

    You can enter a maximum of 255 characters.

    This is a wildcard DNS record set.

    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

  4. Click OK.
  5. Switch back to the Record Sets tab.

    You can view the wildcard DNS record set in the Normal state.

    How Do I Check Whether a Record Set Has Taken Effect?