T-SQL UDF: Convert Traditional IP into Numeric IP

This user-defined function (only available in SQL 2000 and above) is part of a larger project I’m working on. PARSENAME in SQL Server is my new favorite function.. Thanks to Jeff Smith for the heads up.

CREATE      FUNCTION [dbo].[IPtoNumeric]  (@strIP varchar(255))
RETURNS bigint
DECLARE @intIPNum bigint
        IF (LEN(@strIP)-LEN(REPLACE(@strIP,'.','')))/LEN('.') = 3   -- check to ensure there are 3 dots
SET @intIPNum = (16777216 *  CAST(PARSENAME(@strIP,4) as bigint) + 65536 * PARSENAME(@strIP,3) + 256 * PARSENAME(@strIP,2) + PARSENAME(@strIP,1))

You can quickly test this by issuing the following query:
SELECT dbo.IPtoNumeric(‘’) as numericIP

Chrissy is a PowerShell MVP who has worked in IT for nearly 20 years, and currently serves as a Sr. Database Engineer in Belgium. Always an avid scripter, she attended the Monad session at Microsoft’s Professional Developers Conference in Los Angeles back in 2005 and has worked and played with PowerShell ever since. Chrissy is currently pursuing an MS in Systems Engineering at Regis University and helps maintain RealCajunRecipes.com in her spare time. She holds a number of certifications, including those relating to SQL Server, SuSE Linux, SharePoint and network security. She recently became co-lead of the SQL PASS PowerShell Virtual Chapter. You can follow her on Twitter at @cl.

Posted in Networking, SQL Server

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