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Networking: icanhazip.com (lemmy.world)

submitted 16 hours 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 5 points 13 hours ago

some “IoT” devices also use it for some reason

I haven't conducted a thorough investigation, but the last container I added was SpeedTest Tracker and I am assuming that it's using icanhazip.com and ifconfig.co to determine the best test servers based on my locale. I chose my own servers when I set it up. For the time being, I have both blocked and nothing seems to complain. SpeedTest Tracker still crons ever hour with success.