What Is mdnsd Android

MDNS is a relatively new software library on Android. It was initially written for Apple and IOS but has been slowly ported to Android in the past year. Despite being relatively new, the library has already become a popular developer tool. Among its most popular features is support for multicast DNS.

Multicast Domain Name System Daemon

Multicast Domain Name System Daemon (mdnsd) is Android’s version of mDNSResponder, which will be used in the soon-to-be-released Zero Configuration Networking. Services and devices on your network may be found using this tool automatically.

The ability to do name-to-address transformation and other DNS-like activities (mDNS) while a traditional unicast DNS server is unavailable: It allows users to locate hosts by their names instead of their numeric IP addresses, even if they haven’t set up a regular DNS server.

Find Services On the Network (DNS-SD):

The user may also learn about the services that are being promoted on the network without any prior knowledge or system configuration.This daemon is always listening on UDP port 5353 and transmitting multicast broadcasts (questions/advertisements) to all hosts on the local network at IP address


Background processes of mdnsd are requested by any programme that uses Android’s Network Service Discovery. By integrating NSD into your app, your customers will be able to find other gadgets on the same network that have the features your app needs. This is helpful for many kinds of P2P activities, including exchanging files or playing games with other people online.

If you go around any discussion boards, you’ll see that several popular programmes, including Facebook and Firefox, have been called out for being the culprits of rapid battery loss due to their use of mdnsd. The latter has previously experienced a problem that resulted in the aforementioned behaviour. They’ve developed their own version of MDNS. There is a built-in MDNS service in Google Play Services that can locate Google Cast reception devices like Chromecast.

Printers, cameras, HTTPS servers, and other portable devices are all examples of devices that enable NSD. Default Print Service (com.android.bips) and Print Service Suggestion Service (com.android.printservice.recommendation) are two AOSP-bundled programmes that make use of NSD. This means that mdnsd is being performed in the background since you are making use of the device’s printing capabilities. The Android Debug Convergence Daemon (ABDB) is the most prevalent culprit, since it automatically initiates mdnsd.

DNS Protocol

DNS is a popular DNS protocol that works with Android devices. It lets users discover services that use their IP address or ” hostname ” without a network. However, Android does not support this protocol natively, and many users have had to use apps to connect to these services.

To use DNS on Android, you must install the Android DNS resolver. It’s available in the AOSP package and will be fully supported starting in November 2021. The code is available in the DNS resolver library in the AOSP, and you can try it out in your apps by calling getaddrinfo().

DNS uses a broadcast UDP protocol to send IP addresses to local networks instead of a DNS server. Clients send IP multicast queries to local network hosts, and the hosts respond with their IP address. If there are multiple hosts in the network, DNS is a great solution. Unlike traditional IP address resolution, it can work across different subnets and networks.

The ESP32 and ESP8266 Arduino devices have mDNS support. If you’re unfamiliar with this technology, MegunoLink is a powerful software solution for DNS name resolution. Call the AdvertiseServices() function to start a service and specify a name. Then, use MegunoLink to search for the service. The MegunoLink app can also search for other services.

If you’re looking to build an Android application, it’s highly recommended that you use the OS-provided API. Alternatively, if you’re using Linux, you can use libavahi-client or libavahi-glib. The mDNSPosix directory contains the code for DNS and the DNS daemon. To learn more, you can check out the Zero Configuration Networking book.

Multicast DNS

Multicast DNS is a little-known feature of DNS that allows devices to automatically discover each other without needing a DNS server. This feature has many uses, including the automatic discovery in household protocols like Zeroconf/Bonjour and Universal Plug and Play. As such, it’s a natural fit for innovative phone applications. To implement this feature, an intelligent phone developer can use JmDNS, a Java API that is already threaded and supports the MDNS protocol.

Unfortunately, Android does not have active DNS.local support. The earliest Issue Tracker post on the topic is from mid-2011. However, you can find a more recent post on Google. While this issue is still unresolved, a few users have noticed that mDNS.local is working on Android 12.

Battery drain

MDNSD is a significant culprit in Android battery drain. This issue has been around for years, but many people don’t know how to fix it. Luckily, there are solutions. While some will work for some people, others won’t. Here are a few tips for managing MDNSD and improving your battery life.

MDNSD is a multicast functional operating system that can work with multiple commands simultaneously. It can be overloaded by media files or apps that take up internal storage, which is the main culprit in MDNSD battery drain. One way to reduce the problem is to delete caches on your device. This is as easy as clearing the cache from your device’s settings.

A wide variety of applications use DNS. These include apps that frequently hit URLs or updates. If you find the DNS daemon causes your phone’s battery draining problem, you can temporarily try disabling all of them. Then, gradually add back the apps you need to use.

Another cause of battery drain is rouge apps. While you can fix this issue by uninstalling rouge apps, you should also try to update your system and app versions. Updates are usually speedy and will help. However, it can be rare that updates are available for your device. To check if your device is compatible with updates, go to Settings, Advanced, About phone, and click Wireless and System updates.

Controlling DNS

Controlling MDNSD on Android is essential to make your battery last longer. MDNSD uses a lot of CPU when overloading, which isn’t suitable for battery life. To prevent this, you can manage this process by limiting the number of background processes it runs. You can open the Settings app and navigate the battery, device maintenance, or apps section.

The MDNSD process is long-running and uses much of the phone’s battery. It can be triggered by various applications, including those that constantly hit URLs or update frequently. Some systems even allow daemons to run automatically at boot-up. This can make it difficult to limit which apps you use and which don’t.

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