How to Build an AWS Lambda Function to List EC2 Instances Across All Regions (Python 3.14 DIY Guide)

Dec 11, 2025 · 3 min read · Managing EC2 instances across multiple AWS regions can quickly become complicated, especially in large or multi-account environments.If you’ve ever wondered: “How can I get a list of all EC2 instances across all AWS regions?” “How do I build a Lamb...