This topic provides an overview of domain name tags. Tags do not carry special definitions. Each tag is a key-value pair that is used to mark or filter domain names. You can use tags to mark, group, filter, and manage domain names.


Tags have the following limits:
  • Each tag is a key-value pair.
  • You can add at most 20 tags to a domain name.
  • Among the tags that are added to the same domain name, the key of each tag must be unique. If two tags have the same key but different values, the later one overwrites the earlier one. For example, if you create the Key1:Value1 tag and then the Key1:Value2 tag for the domain name, only the Key1:Value2 tag is added to the domain name.
  • A key cannot start with aliyun or acs:, contain http:// or https://, or be left unspecified.
  • A value cannot contain http:// or https://, but can be left unspecified.
  • A key must be 1 to 64 Unicode characters in length.
  • A value must be 0 to 128 Unicode characters in length.
  • Tags are case-sensitive.


You can use tags to manage domain names, as described in the following table.
Feature Description
Add tags to domain names Add tags to one or more domain names to group and manage the domain names.
Remove a tag Remove tags from domain names if the tags are no longer suitable for managing or filtering domain names.
Use tags to manage domain names Filter or group domain names based on specific tags.
Query data of domain names by tag Use tags to filter monitoring data such as bandwidth values and cache hit ratios of a specified group of domain names.
Tag use case Cases on how to manage domain names by using tags.