Whitelist IP range change notifications?

I’m whitelisting Cloudflare IP ranges to serve static sites from S3 buckets, using the IP ranges here: https://www.cloudflare.com/ips/

It’s working fine, but I’m not sure how to keep this up to date? Is there a mailing list to be notified of changes to Cloudflare’s IP ranges?

It very rarely changes. I can’t even remember a time in the past several years that it’s changed. But, no, there’s no alert system of an update. At least the page is timestamped. I don’t know what happened in February of 2019 that prompted them to update that page, but I don’t think it was IP addresses.

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