The GetResources operation of the Resource Groups Tagging API helps you return all the tagged or previously tagged resources located in the specified region in an AWS account. The GetResources operation now supports the ResourceARNList parameter. This new parameter accepts a list of up to 100 Amazon Resource Names (ARNs), and returns a list of the specified resources and the tag data attached to each. This new ResourceARNList parameter lets you keep track of the tag status of the AWS resources you care about. Instead of having to do multiple calls to check for each resource individually, and then assemble the results, this feature lets you check tag status for multiple ARNs and get the results using a single call.
Source:: Amazon AWS