CFLib.org – Common Function Library Project

Description:
calculate a network address from an IP address and a (sub)Netmask. Does not validate either input parameter.

Return Values:
Returns an IP address (string).

Example:

<cfoutput>
#calcNetAddress('217.136.252.232','255.255.255.197')#
</cfoutput>

Parameters:

Full UDF Source:

/**
 * calculate a network address from an IP address and a (sub)Netmask.
 * 
 * @param myIP      IP Address. (Required)
 * @param myNetMask      Netmask. (Required)
 * @return Returns an IP address (string). 
 * @author Tanguy Rademakers (t@newmediatwins.net) 
 * @version 1, May 12, 2003 
 */
function calcNetAddress (myIP, myNetMask) {
    var NetAddress = "";
    var i = 1;
    
    for (i = 1; i lte 4; i = i + 1) {
        NetAddress = ListAppend(NetAddress, BitAnd(ListGetAt(myIP,i,'.'),ListGetAt(myNetMask,i,'.')) ,'.'); 
    }
    return NetAddress;
}