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ZeroConf actually works pretty well as long as everything is in the same range.

Is that on a Mac? Windows doesn't seem to support it.

It's called "Bonjour" on Windows and Mac. Windows doesn't have support out of the box, but you can get it. https://learn.adafruit.com/bonjour-zeroconf-networking-for-w...

Edit: until build 1703 in 2017. Huh!

Windows uses mdns natively now. That article is 10 years old.

Did you change your router settings? It should all heal up with a simple broadcast packet.

It could be your router defaults to blocking broadcast packets related to wireless devices. (Either in or out)

Range as in L2?

L3. ZeroConf is broadcast which doesn't go outside of your current IP's subnet.