What is mDNSResponder.exe?

The genuine mDNSResponder.exe file is a software component of Bonjour by Apple.
MDNSResponder.exe is an executable file that is associated with Bonjour, a zeroconf (zero-configuration networking) implementation designed by Apple. This is not an essential Windows process and can be disabled if known to create problems.

Bonjour automatically detects devices located on a network and the services they offer using the multicast Domain Name System. The software is shipped with Mac OS X and iOS but is also available for Microsoft Windows. The software was designed with the main intention of setting up networks a hassle-free task. Bonjour is currently used by many software programs t quickly connect to the network.

Apple Inc. is an American company that develops consumer electronics, computer software, as well as online services. The company is known for its smartphones, tablet computers, personal computers, media players and smartwatches. Apple develops the OS X and iOS operating systems, the iTunes media player, the Safari web browser, as well as several dozen productivity suites. Apple was founded by Steve Jobs, Steve Wozniak, and Ronald Wayne in 1976, to develop and sell personal computers. The company is currently based in Cupertino, California, USA.

MDNSResponder stands for Bonjour Multicast Domain Name System Responder

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the mDNSResponder.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for mDNSResponder.exe related errors

MDNSResponder.exe file information

Windows Task Manager with mDNSResponder
MDNSResponder.exe process in Windows Task Manager

The process known as Bonjour Service or RIM MDNS Service or System or Bonjour or Dante Discovery Service or RIM MDNS

belongs to software Bonjour or Adobe Version Cue (version CS3 Client) or ##Id_String1.6844F930_1628_4223_B5CC_5BB94B879762 or BlackBerry Link or VLC Streamer or Xamarin Bonjour Service or Extensis Suitcase Fusion (version 2, 6) or RIM MDNS

by Apple ( or Apple Computer ( or Audinate Pty. or System.

Description: MDNSResponder.exe is not essential for Windows and will often cause problems. MDNSResponder.exe is located in a subfolder of "C:\Program Files (x86)"—mostly C:\Program Files (x86)\Bonjour\. Known file sizes on Windows 10/8/7/XP are 462,184 bytes (27% of all occurrences), 390,504 bytes and 19 more variants. 
The process runs as service Bonjour. The service enables hardware devices and software services to automatically configure themselves on the network and advertise their presence.
The program is not visible. The file is not a Windows core file. The application uses ports to connect to or from a LAN or the Internet. You can uninstall this program in the Control Panel. The file has a digital signature. MDNSResponder.exe is a Verisign signed file. Therefore the technical security rating is 22% dangerous; however you should also read the user reviews.

Uninstalling this variant: In case of problems with mDNSResponder.exe, you can also uninstall Bonjour or Adobe Version Cue CS3 Client from your computer using the Control Panel applet Uninstall a Program, get help from the software vendor Apple or search for an update on the vendor’s website.

Recommended: Identify mDNSResponder.exe related errors

Important: Some malware camouflages itself as mDNSResponder.exe. Therefore, you should check the mDNSResponder.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Each time this is executed it appears in my task manager list. (After my computer freezes up and has to be rebooted)
it seems to be a virus
  Tommy tang  
It was in C:/ProgramFiles(86x)/Bonjour And C:/ProgramFiles(86x)/Mirroring360 It Wasn't There Originally And It Cause Sounds To Play Like Those Internet Scams With The Fake Virus Detected Scams. UNINSTALL NOW!!!
gets installed with Logitech Gaming Software version 8.57+. "Apple Bonjour - Network Discovery Support for Logitech Arx Control"
  jakethedog   (further information)
Bonjour Service - used with iTunes and other programs
The Bonjour for Windows package provides Bonjour zero-configuration networking services for use by Windows applications such as iTunes, Safari and AirPort Utility. Bonjour enables computers and devices to automatically discover each other using industry standard IP protocols without the need to manually enter IP addresses or configure DNS servers. It is particularly useful for connecting to devices such as the iPhone, Apple TV, and AirPort base stations. Bonjour is commonly installed by third-party software to provide zero-configuration networking capabilities to various applications. Developers can download the Bonjour SDK to add Bonjour technology to their applications. For more information about developing products that use Bonjour, and to download the SDK, please visit .
Suddenly appeared in my system running with access in firewall without ever triggering it to ask if it was OK to let through, that alone scares me into thinking this can't be good since I don't have a Mac or anything requiring this on my computer.
it is just virus
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of mDNSResponder.exe: based on 229 votes with 9 reviews. 51 users think mDNSResponder.exe is essential for Windows or an installed application. 21 users think it's probably harmless. 83 users think it's neither essential nor dangerous. 38 users suspect danger. 36 users think mDNSResponder.exe is dangerous and recommend removing it. 44 users don't grade mDNSResponder.exe ("not sure about it").

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Best practices for resolving mDNSResponder issues

A clean and tidy computer is the key requirement for avoiding problems with mDNSResponder. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the mDNSResponder.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

mDNSResponder.exe [all]