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Tags provide specific identification and classification of AWS resources by associating them with descriptive metadata. A tag basically consists of a key and a value, both of which are defined by the user. Once defines, these tags can be used to filter when requesting specific resources.

Tagging Restictions

Maximum number of tags per resource – 10

Maximum key length – 127 Unicode characters 

Maximum value length – 255 Unicode characters

Tag keys and values are case sensitive 

Tag keys must be unique per resource  

Do not use the “aws:” prefix in your tag name or values because it is reserved for AWS use

They also tackle on other topics such as tagging API and CLI Commands and Tagging Filters using AWS Tools for Windows PowerShell.


Tagging is an effective tool to help manage AWS resources at increasing scale, providing the ability to identify, classify and locate resources for management and billing purposes.


Amazon EC2 filtering provides a way to both locate tagged resources and validate that the tagging standards in your organisation are being properly implemented. Naming best practices can be leveraged to achieve consistency across your environment and maximise the benefits that tagging has to offer.