ESP32 mDNS Service Not Discoverable

In this tutorial, you'll learn about ESP32 mDNS Service Not Discoverable. We cover key concepts, practical examples, and best practices.

The Problem

ESP32 mDNS service is registered but cannot be found by other devices on the network.

Quick Fix

Wrong

MDNS.begin("esp32");
MDNS.addService("http", "tcp", 80);

No device found when browsing for _http._tcp on the network.

Right

if (MDNS.begin("esp32-web")) {
  MDNS.addService("http", "tcp", 80);
  MDNS.addServiceTxt("http", "tcp", "path", '/");
  MDNS.addServiceTxt("http", "tcp", "version", "1.0");
  Serial.println("mDNS responder started');
}

mDNS responder started
(Device found as esp32-web.local with service _http._tcp)

Prevention

Use unique hostnames to avoid conflicts. Add TXT records for service metadata. Ensure devices are on the same subnet. Multicast DNS requires network support (most home networks work). Call MDNS.update() periodically.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

FAQ