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Configure IIS to Perform Reverse DNS Lookups

By default, performing a Request.ServerVariables("REMOTE_HOST") in ASP returns the value of REMOTE_ADDR, the IP address of the client.

You can have the REMOTE_HOST variable return the Host Name instead by using the Adsutil.vbs script.

The default locations for this script are:
IIS 4.0 - C:\WinNT\System32\InetSrv\AdminSamples
IIS 5.0 - C:\InetPub\AdminScripts

Once you find the location of the adsutil.vbs script, open a command prompt and cd to the directory that holds the script (cd InetPub\AdminScripts). Then type:
cscript adsutil.vbs set /w3svc/EnableReverseDNS "TRUE"

The value of Request.ServerVariables("REMOTE_HOST") will now return the Remote Host name and not the IP Address.

Note: While this can be useful, caution should be exercised when making this change as it requires extra processing and can have a detrimental effect on server performance. Be sure to test your application and server setup to be sure it can handle the additional load and that the performance hit is acceptable before enabling this lookup in a production environment.

More info is available from MSDN: KB Article Q245574

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