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A comment on Ask HN: How did internet discover my subdomain?. Parent comment

Re:Ask HN: How did internet discover my subdomain? by jchw on Friday March 07, 2025 @07:20AM (#43289570)
I misunderstood, I thought the subdomain was an R2 bucket. If it's just normal Cloudflare proxying to some backend this is probably the most likely answer.

That said, while I think it's not the case here, using Cloudflare doesn't mean the underlying host is accessible, as even on the free tier you can use Cloudflare Tunnels, which I often do.

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Re:Ask HN: How did internet discover my subdomain? by ratg13 on Friday March 07, 2025 @07:44PM (#43296440)
they only state they are using cloudflare for DNS, they didn't say if they were proxying the connection
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Re:Ask HN: How did internet discover my subdomain? by jchw on Friday March 07, 2025 @11:57PM (#43297617)
Also a valid point. I guess without more details all we can really do is speculate about the exact setup. That said, I do now agree that the most likely answer is "the underlying host was accessible and caught by an IPv4 scanner" since well, that's pretty much what it says anyway.
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