PC Pitstop Libraries > Process Library > mdnsresponder.exe
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What is mdnsresponder.exe? Bonjour Service

Vendor:      Apple
Product:     Bonjour
Vendor Website:      http://developer.apple.com/networking/bonjour/
Last Seen by PC Pitstop:      No Data

Process is Bad PC Pitstop has analyzed this process and determined that there is a high likelihood that it is bad.
Process is questionablePC Pitstop has analyzed this process and determined that the safety of this process is questionable.
Process is goodPC Pitstop has analyzed this process and determined that there is a high likelihood that it is good.
Process is goodThis process is a Microsoft or Windows process, but many viruses use this file name to escape notice.

PC Pitstop Analysis

Purpose: mDNSResponder.exe is a file used by the Apple Bonjour Networking service. According to Apple:
"Bonjour, also known as zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. Bonjour uses industry standard IP protocols to allow devices to automatically discover each other without the need to enter IP addresses or configure DNS servers. "

Gizmo Project (http://www.gizmoproject.com) adds Bonjour Service to the Windows XP (or Windows 2000, or Windows NT) Services folder.
This service starts automatically and runs a process named mDNSResponder.exe which cannot be ended by Windows Task Manager.
To remove, it must first be disabled in Services. mDNSResponder.exe is essentially the "driver" for this networking service.

Apple is the developer of the Bonjour Networking.
SIPphone, Inc. [www.sipphone.com] is the developer of the Gizmo Project software and service.

Bonjour allows applications like iTunes and Safari to advertise and discover services on the local network. Having Bonjour running enables you to connect to hardware devices like Apple TV and software services like iTunes sharing and AirTunes. If you disable Bonjour, any network service that explicitly depends on it will fail to start.

mdnsresponder.exe uses excessive system and memory resources with no corresponding benefit. Applications such as these should be disabled to improve overall system performance.

PC Pitstop recommends WinPatrol Plus for monitoring all of the background activity on your PC. WinPatrol Plus provides an easy to understand descriptions of over 15,000 processes and programs.


mdnsresponder.exe is known to be a bad process. Start this Free scan to check your other threats to your PCs security, like this file.
mdnsresponder.exe could be a harmful process. Start this Free Scan to check for threats to your PC Security.
This information brought to you by PC Matic SuperShield. Start this Free scan to check your threats to your PCs security.
mdnsresponder.exe is a Microsoft or Windows process but some versions of this exe carry viruses.
Check your PC for the bad versions of this file - with this
Free Security Scan.

mdnsresponder.exe Technical Information

Percentage of recently scanned PC's with this process running: 5.05%
Average CPU use for this program: 0%
Average RAM for this program: 3 MB

MD5 Hash Analysis

Program Name MD5 Count
mdnsresponder.exe

MD5 Hashes Expand md5 List Collapse md5 List
# Status MD5 File Info Last Seen Signed Day Week Month Threat info
1 Status 0xebbcd5dfbb1de70e8f4af8fa59e401fd More File Information 6/15/2013 Signed 16 113 451 Not Applicable
2 Status 0xdb5bea73edaf19ac68b2c0fad0f92b1a More File Information 6/15/2013 Signed 7 60 255 Not Applicable
3 Status 0x73686fe0b2e0469f89fd2075be724704 More File Information 6/14/2013 Unsigned 0 1 3 Not Applicable
4 Status 0x3f56903e124e820aeece6d471583c6c1 More File Information 6/11/2013 Signed 0 1 4 Not Applicable
5 Status 0x5ab58c337ac65837fe404462ad6265ab More File Information 6/11/2013 Signed 0 1 1 Not Applicable
6 Status 0xf832f1505ad8b83474bd9a5b1b985e01 More File Information 6/8/2013 Signed 0 0 3 Not Applicable
7 Status 0xa065f048e9e23e6c026a7bb548d126a7 More File Information 6/6/2013 Signed 0 0 5 Not Applicable
8 Status 0x673cf4f6bb1fbe09331b526802fbb892 More File Information 6/4/2013 Unsigned 0 0 1 Not Applicable
9 Status 0x5ef9831ee73c5aafdc4d7a56adda8c39 More File Information 5/12/2013 Unsigned 0 0 0 Not Applicable
10 Status 0x62d717d15c4ef6925732f43878511c3a More File Information 12/29/2012 Unsigned 0 0 0 Not Applicable
11 Status 0x1c87705ccb2f60172b0fc86b5d82f00d More File Information 10/20/2012 Signed 0 0 0 Not Applicable
12 Status 0x1bd3d8ea5bd3a1bb318cd8b1db2c4fa6 More File Information No Data Unsigned 0 0 0 Not Applicable
13 Status 0x11896cfd1b6b114b1701d4f4d7dff36b More File Information No Data Unsigned 0 0 0 Not Applicable
14 Status 0x0f832f1505ad8b83474bd9a5b1b985e0 More File Information No Data Unsigned 0 0 0 Not Applicable
MD5 Hashes Expand md5 List Collapse md5 List
# Status MD5 Last Seen File Date Revision Common Name Size
1 Status 0x3cb1d422009df709c5693d40699fb03e 3/4/2013 5:35:00 PM Unknown Unknown Bonjour Service 567 KB
2 Status 0x5c586b136dd1accfe86e71f20dac7c77 10/8/2012 8:13:00 PM Unknown Unknown Bonjour Service 341 KB
3 Status 0xc7d6dc684e722d041fcd84acc4faacb1 8/8/2012 4:41:00 PM Unknown Unknown Bonjour Service 349 KB
4 Status 0x69591590a904374ee99c96c786696c3c 7/2/2012 1:01:00 PM Unknown Unknown Bonjour Service 337 KB
5 Status 0x3bfff53fe4930565a3c898c338f9a145 5/29/2012 9:19:00 PM Unknown Unknown Bonjour Service 232 KB
6 Status 0x10037c3c4739f233ba0974947e6a804f 3/10/2012 4:54:00 AM Unknown Unknown Bonjour Service 233 KB
7 Status 0xdb5bea73edaf19ac68b2c0fad0f92b1a 2/8/2012 4:39:00 AM Unknown Unknown Bonjour Service 381 KB
8 Status 0xf2060a34c8a75bc24a9222eb4f8c07bd 2/8/2012 3:38:00 AM Unknown Unknown Bonjour Service 341 KB
9 Status 0xf832f1505ad8b83474bd9a5b1b985e01 2/8/2012 3:14:00 AM Unknown Unknown Bonjour Service 337 KB
10 Status 0xebad0f51d8d4dade7660b1851addbd07 2/8/2012 2:58:00 AM Unknown Unknown Bonjour Service 337 KB
11 Status 0x3f56903e124e820aeece6d471583c6c1 2/8/2012 12:03:00 AM Unknown Unknown Bonjour Service 233 KB
12 Apple:
"Bonjour, also known as zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. Bonjour uses industry standard IP protocols to allow devices to automatically discover each other without the need to enter IP addresses or configure DNS servers."

Gizmo Project (http://www.gizmoproject.com) adds Bonjour Service to the Windows XP (or Windows 2000, or Windows NT) Services folder.
This service starts automatically and runs a process named mDNSResponder.exe which cannot be ended by Windows Task Manager.
To remove, it must first be disabled in Services. mDNSResponder.exe is essentially the "driver" for this networking service.

Apple is the developer of the Bonjour Networking.
SIPphone, Inc. [www.sipphone.com] is the developer of the Gizmo Project software and service.
">Status		 0xcfd4c3352e29a8b729536648466e8df5 2/7/2012 10:12:00 PM Unknown 1,0,4,12 Bonjour Networking 224 KB
13 Status 0x673cf4f6bb1fbe09331b526802fbb892 2/7/2012 7:21:00 PM Unknown Unknown Bonjour Service 337 KB
14 Status 0x5ab58c337ac65837fe404462ad6265ab 2/7/2012 3:36:00 PM Unknown Unknown Bonjour Service 337 KB
15 Status 0x1c87705ccb2f60172b0fc86b5d82f00d 2/7/2012 1:02:00 PM Unknown Unknown Bonjour Service 378 KB
16 Status 0xa065f048e9e23e6c026a7bb548d126a7 2/6/2012 10:33:00 PM Unknown Unknown Bonjour Service 337 KB
17 Status 0x9efe4236f8670846b6e7c5b0eff6e715 2/6/2012 7:10:00 PM Unknown Unknown Bonjour Service 233 KB
18 Apple:
"Bonjour, also known as zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. Bonjour uses industry standard IP protocols to allow devices to automatically discover each other without the need to enter IP addresses or configure DNS servers."

Gizmo Project (http://www.gizmoproject.com) adds Bonjour Service to the Windows XP (or Windows 2000, or Windows NT) Services folder.
This service starts automatically and runs a process named mDNSResponder.exe which cannot be ended by Windows Task Manager.
To remove, it must first be disabled in Services. mDNSResponder.exe is essentially the "driver" for this networking service.

Apple is the developer of the Bonjour Networking.
SIPphone, Inc. [www.sipphone.com] is the developer of the Gizmo Project software and service.
">Status		 0x73686fe0b2e0469f89fd2075be724704 2/6/2012 6:37:00 AM Unknown 1,0,3,1 Bonjour Networking 224 KB
19 Apple:
"Bonjour, also known as zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. Bonjour uses industry standard IP protocols to allow devices to automatically discover each other without the need to enter IP addresses or configure DNS servers."

Gizmo Project (http://www.gizmoproject.com) adds Bonjour Service to the Windows XP (or Windows 2000, or Windows NT) Services folder.
This service starts automatically and runs a process named mDNSResponder.exe which cannot be ended by Windows Task Manager.
To remove, it must first be disabled in Services. mDNSResponder.exe is essentially the "driver" for this networking service.

Apple is the developer of the Bonjour Networking.
SIPphone, Inc. [www.sipphone.com] is the developer of the Gizmo Project software and service.
">Status		 0xcc4e72a0fa7f62175c8bb42ba2caa3d5 2/2/2012 9:14:00 PM Unknown 1,0,2,9 Bonjour Networking 224 KB
20 Status 0x8aa1e87be6c3af20c10ad69faf5368e6 11/9/2011 12:12:00 PM Unknown Unknown Bonjour Service 226 KB
21 Status 0x8d03fa76f2a6970f6f3aea3cfbb17358 10/23/2011 4:18:00 PM Unknown Unknown Bonjour Service 337 KB
22 Status 0x86223be36535575d7bc713ca2ee5c711 10/17/2011 2:53:00 PM Unknown Unknown Bonjour Service 337 KB
23 Status 0x87df66c3bb4ad3061b58b8fbcdcd55b6 10/7/2011 2:38:00 PM Unknown Unknown Bonjour Service 381 KB
24 Status 0xd0a3d6d0d183fc99a5e33a295a415de1 9/4/2011 5:33:00 PM Unknown Unknown Bonjour Service 240 KB
25 Status 0x584ae284fcdc28020a8f1c67ab7a416c 8/30/2011 4:58:00 PM Unknown Unknown Bonjour Service 228 KB



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If you are unable to identify a file, ask about it in our forums after running our full tests.