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Do you remember the private IP address that was set for EC2?
If you remember, you can set the IP address when restoring EC2 from a snapshot.
When restoring an EC2, it is possible to start it with the same private IP address by setting the Primary IP.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-launch-instance-wizard.html#liw-network-settings
It seems like you're asking about how to recover a private IP address for an EC2 instance. If you have an EC2 instance that was previously running and you want to find its private IP address, you can do the following:
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Sign in to the AWS Management Console: Go to the AWS website (https://aws.amazon.com/) and sign in using your credentials.
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Navigate to EC2 Dashboard: Once you're logged in, navigate to the EC2 Dashboard by searching for "EC2" in the AWS Management Console's search bar and clicking on the EC2 service.
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Locate your EC2 Instance: In the EC2 Dashboard, click on "Instances" from the left-hand sidebar to see a list of all your EC2 instances.
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Identify the EC2 Instance: Find the specific EC2 instance for which you want to recover the private IP address from the list of instances. You can use filters or sort the instances to locate it quickly.
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View the Private IP Address: Once you have identified the EC2 instance, you can find its private IP address listed under the "Private IP" column in the table of instances.
If your EC2 instance is not running or you no longer have access to the AWS Management Console, you may have to start the instance or use other methods to retrieve its private IP address, depending on your specific situation.
If you launched the instance within the last 3 months or if you have Cloudtrail configured to store the logs you can search for the event name RunInstances. Go to Cloudtrail, Event history and look for Event Name RunInstances.
Thanks it worked.