androidmdns

Samsung Galaxy S10 cannot resolve mDNS .local

Samsung Galaxy S10+, Android 12.

According to Samsung, mDNS is now supposed to work on Android 12 and newer. On my Windows 10 machine I can ping and access the webpage on power.local (an Arduino ESP8266 web server running mDNS). However, my phone cannot resolve the power.local address. I've set the DNS to the main router, same as on Win 10.

Running ping power.local on Win10: enter image description here Running ping power.local on Samsung Galaxy: enter image description here

Win 10 correctly first ask the regular DNS and then performs a mDNS multicast. The phone only resorts to regular DNS and never performs a multicast DNS.

mDNS, simple explanation https://www.androidpolice.com/android-mdns-local-hostname/

mDNS, technical https://blog.esper.io/android-dessert-bites-26-mdns-local-47912385/

Solution

  • Seems like my phone somehow was not eligible to the mandatory update which included the mDNS package.

    To find out if your phone has the package you can run: adb shell dumpsys package com.google.android.resolv

    If it does not return the package, it is not installed on that phone.