What is mdnsNSP.dll?

The genuine mdnsNSP.dll file is a software component of Bonjour by Apple.
MdnsNSP.dll is a DLL (Dynamic Link Library) file that belongs to Bonjour, a zeroconf (zero-configuration networking) implementation designed by Apple. DLL files store data, code and resources needed by one or more programs in order to function correctly. 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.

MDNSNsP stands for Bonjour Multicast Domain Name System Namespace Provider

MdnsNSP.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. You can fix your mdnsNSP.dll problem by downloading the correct mdnsNSP.dll file. The following information can help you determine if mdnsNSP.dll is a Windows system file or if it belongs to an application that you can trust.

Click to Run a Free Scan for mdnsNSP.dll related errors

MdnsNSP.dll file information

The process known as Bonjour Namespace Provider belongs to software Bonjour or Adobe Version Cue (version CS3 Client) by Apple ( or Apple Computer (

Description: MdnsNSP.dll is not essential for Windows and will often cause problems. MdnsNSP.dll is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 121,704 bytes (74% of all occurrences), 122,128 bytes, 94,208 bytes, 152,864 bytes or 147,456 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program is not visible. There is no detailed description of this service. It can change the behavior of other programs or manipulate other programs. The mdnsNSP.dll file is not a Windows core file. MdnsNSP.dll is a Verisign signed file. MdnsNSP.dll is certified by a trustworthy company. The process can be uninstalled in the Control Panel. Therefore the technical security rating is 35% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you encounter difficulties with mdnsNSP.dll, you may also turn to the software developer, Apple, for advice, make sure that you have installed the latest version or safely remove the program using the uninstall program of Bonjour or Adobe Version Cue CS3 Client (Control Panel ⇒ Uninstall a Program).

Recommended: Identify mdnsNSP.dll related errors

Important: Some malware camouflages itself as mdnsNSP.dll. Therefore, you should check the mdnsNSP.dll 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

Part of Apple's Bonjour and/or Rendezvous zero configuration networking, most often added by Itunes version 5.0 and later.
  bill franklin  

Summary: Average user rating of mdnsNSP.dll: based on 2 votes with 2 user comments. One user thinks it's probably harmless. One user thinks mdnsNSP.dll is dangerous and recommends removing it.

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Best practices for resolving mdnsNSP issues

A clean and tidy computer is the key requirement for avoiding problems with mdnsNSP. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the mdnsNSP.dll process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

mdnsNSP.dll [all]