submitted 1 day ago by irmadlad@lemmy.world to c/selfhosted@lemmy.world

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Recently, I saw icanhazip.com pop up in my pFsense firewall logs. It was immediately blocked but the name piqued my interest, so I did a little digging which revealed an interesting backstory.

It's owned by Cloudflare:

spoiler

...but it hasn't always been theirs: icanhazip: How a simple IP address tool survived a deluge of users. Pretty interesting, at least to me as I have never encountered it before.

I have it still blocked as nothing I'm doing seems hampered by blocking icanhazip.com's ip range. Anyone else ever encounter icanhazip.com?

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[-] irmadlad@lemmy.world 2 points 16 hours ago

I think I found the source of the icanhazip.com block. From the Github Issues page:

2025-03-27 17:00:02] production.ERROR: Failed to fetch external IP address. ["cURL error 60: SSL: no alternative certificate subject name matches target hostname 'icanhazip.com' (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://icanhazip.com/"]

this post was submitted on 28 Jun 2026

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