Best: Curl-url-http-3a-2f-2f169.254.169.254-2flatest-2fapi-2ftoken

: IMDSv2 requires a PUT request to ensure that simple GET-based SSRF vulnerabilities cannot trigger a token generation.

The command curl -X PUT "http://169.254.169" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600" is a critical component of modern cloud security within Amazon Web Services (AWS). It represents the transition from the legacy Instance Metadata Service Version 1 (IMDSv1) to the more secure . What is 169.254.169.254? curl-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fapi-2Ftoken

Once you have the $TOKEN , you can access the metadata safely: : IMDSv2 requires a PUT request to ensure

The IP address is a link-local address used by AWS to provide the Instance Metadata Service (IMDS) . Every EC2 instance can query this address to retrieve information about itself—such as its instance ID, public IP, IAM role credentials, and security groups—without needing to call the AWS API externally. The Evolution: From IMDSv1 to IMDSv2 What is 169

Understanding the AWS IMDSv2 Token Fetch Command: curl 169.254.169