If you have a ton of EC2 instances, one way to get results quickly is to run to use AWS CLI such as “describe-instances.” Here’s an example on how to get a list of instances with a tag name equal to some value. In addition, you limit the display only results you want displayed.
$ aws ec2 describe-instances \ --query 'Reservations[].Instances[].Tags[?Key==`Name`].Value' \ --filter Name=tag:Project,Values=web \ --region us-east-1 \ --profile default \ --output text |
This returns values of the “Name” tag name in instances where they occur.