What is ipnat?

Ipnat.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if ipnat.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for ipnat drivers in need of updating

Ipnat.sys file information

The process known as IP Network Address Translator belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original ipnat.sys is an important part of Windows and rarely causes problems. Ipnat.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 152,832 bytes (55% of all occurrences), 134,912 bytes or 79,488 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. It is a Windows core system file. The program has no visible window. Ipnat.sys is a trustworthy file from Microsoft. ipnat.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous, however you should also read the user reviews.

Recommended: Identify ipnat.sys related errors

Important: Some malware disguises itself as ipnat.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the ipnat.sys 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

ntbtlog.txt shows "Did not load driver"
Nothing other than it is the file mentioned when I get the blue screen
  Jim Dise  
blocking firewall configuration
  samir hilary  
is ip network address translator. used by windows firewall if installed on a server that does not have ISA etc installed its ok to stop and disable it
  Sharique Ahmed  
used for firewall and Rass service in sbs 2003
  Ettienne   (further information)
ntbtlog.txt shows "Can't load driver"...
I ran a search for the file after the error occured. I found a duplicate in a different folder as a result of a download. Remove it if it is in a folder other than C:\Windows\System32\drivers
Microsoft office.

Summary: Average user rating of ipnat.sys: based on 5 votes with 8 user comments. 3 users think ipnat.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks ipnat.sys is dangerous and recommends removing it. 4 users don't grade ipnat.sys ("not sure about it").

Do you have additional information? Help other users!
What do you know about ipnat.sys:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving ipnat issues

A clean and tidy computer is the key requirement for avoiding problems with ipnat. 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 ipnat.sys 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

ipnat.sys [all]