Mini web site that uses a lambda function to search a host name or IP address in the list of AWS address ranges, see https://aws.amazon.com/blogs/aws/aws-ip-ranges-json/
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isitonaws.js
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README.md

Is It on AWS?

A couple of Lambda functions that combine to support the mini-website at IsItOnAWS.com

How it works

The Lambda function in newranges.js is subscribed to the SNS topic announcing changes to the IP-Ranges JSON resource. It retrieves that resource and generates another function based on the code in isitonaws.js, including a form of the IP-Ranges compiled to make it easily searchable.

Why?

To show a bunch of different AWS services working together to produce a hands-off, simple, serverless mini-app.