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4GuysFromRolla.com : ASP FAQS : Networking


Question:

How can I perform a Reverse DSN Lookup through ASP?


[Print this FAQ]

Answer: ASP does not contain any intrinsic objects to handle reverse DNS lookups, but, due to ASP's ability to use COM objects, you can perform complex tasks through an ASP page (such as performing a reverse DNS lookup). There are a number of options you have to be able to perform this task with ASP:

1.) Build you own reverse DSN lookup component

2.) Buy a third-party component that will do this for you. You can find a list of such componentns here

3.) Alter the IIS MetaBase to automatically perform Reverse DSN Lookups on incoming IP requests and then access the Request.ServerVariables("REMOTE_HOST") server variable. For more information, check out: HOWTO: Configure REMOTE_HOST to Perform a Reverse DNS Lookup in IIS (A thank you to Richard Lowe for this heads up tip!).

4.) Use the Windows Scripting Host features to execute a Windows NT command line program to perform this lookup. You will need to have installed WSH 2.0 to accomplish this, which can be freely downloaded at: http://www.microsoft.com/msdownload/vbscript/scripting.asp.

An article at ASP101.com describes how to write an ASP script version using the Windows Scripting Host. For the complete source code to this application, check out this article by Jason Withrow: ASP Based Reverse DNS Lookup

If you know of any other way to perform a reverse DNS lookup, be sure to let me know!

FAQ posted by Scott Mitchell at 1/31/2001 2:34:10 AM to the Networking category. This FAQ has been viewed 50,596 times.

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Last computed at 9/17/2007 3:22:00 AM


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