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Worth mentioning the Iodine project which allows for arbitrary IPv4 to be tunnelled over DNS, which can be useful on a few different restrictive networks.

https://code.kryo.se/iodine/

(I also like the naming pun; DNS running on port 53 with Iodine having the atomic number 53.)

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I'm running one on an older RPi at home. Never really "needed" it, but sending text messages for free from an airplane wifi somewhere above the atlantic ocean felt like a nice nerdy flex.

I've seen it work on most wifi networks where you need to log in (or check a box) on a web portal before access. Basically anything that uses HTTP redirect captive portals will probably work, as UDP port 53 isn't blocked.

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