There is often a need to determine which application pool a w3wp.exe process is responsible for. There are separate commands for determining this in depending on the version of IIS.

IIS 6:
When running IIS 6 the following command can be used in a command prompt:

iisapp

Example output:

This process ID will match what is displayed on the Task Manager.

IIS 7:
The iisapp command will not work on IIS 7 however Microsoft provides an equivalent command:


%windir%\system32\inetsrv\appcmd.exe list wp

Example output:

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