CFLib.org – IPAddress2IPDottedDecimal

IPAddress2IPDottedDecimal([ipAddress])

Last updated September 27, 2002

author

Jonathan Pickard
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Version: 1 | Requires: ColdFusion 5 | Library: NetLib

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Description:
Use IPAddress2IPDottedDecimal to convert an IP address string to a decimal value. Storing decimal values in a database and making comparisons with them is more efficient than using IP address strings.

Return Values:
Returns a number.

Example:

<cfoutput>
#IPAddress2IPDottedDecimal( "192.168.0.7" )#
</cfoutput>

Parameters:

Name	Description	Required
ipAddress	IP Address to convert.	No

Full UDF Source:

	
	<cfscript>
/**
 * Converts an IP address to a 32-bit dotted decimal IP number.
 * 
 * @param ipAddress      IP Address to convert. (Optional)
 * @return Returns a number. 
 * @author Jonathan Pickard (j_pickard@hotmail.com) 
 * @version 1, September 27, 2002 
 */
function IPAddress2IPDottedDecimal( ipAddress ) {
    var    ipValue = 0;
    var lBitShifts = "24,16,8,0";
    var i = 1;

    if ( ListLen( ipAddress, "." ) EQ 4 )
    {
        for ( ; i LTE 4; i = i + 1 )
        {
            ipValue = ipValue + BitSHLN( ListGetAt( ipAddress, i, "." ), ListGetAt( lBitShifts, i ) );
        }
    }

    return ipValue;
}
</cfscript>