How to find account behind ip address 15.197.142.173

Question

A site that was thought to be on another provider is being hosted by Amazon at ip address 15.197.142.173. How can I find out which account owns that ip address? I've looked through our AWS accounts and it's not in any of them.

Answer

There's a bunch of places you could have a public IPs defined.  Have you checked for example EC2 instances, elastic IPs, load balancers, CloudFront, maybe even Global Accelerator?  Also could it possibly be in a different region that you expect?
If you have a lot of accounts you could script your checks, for example using the CLI to check EC2 instances with server-side filtering:
aws ec2 describe-instances --filters Name=ip-address,Values=15.197.142.173

How to find account behind ip address 15.197.142.173

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