CFLib.org – Common Function Library Project

Description:
Converts an IP address to a network class.

Return Values:
Returns a string.

Example:

<cfset varip = "192.168.0.1">
<cfset varclass = ipclass("192.168.0.1")>
<cfoutput>
    IP: #varip#<br />
    Class: #varclass#<br />
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Converts an IP address to a network class.
 * 
 * @param ip      IP address. (Required)
 * @return Returns a string. 
 * @author del usr (delusrexpert@hotmail.com) 
 * @version 1, February 14, 2004 
 */
function IPclass(ip) {
    var myint = listFirst(ip, ".");
    if (myint GTE 1 and myint LTE 127) return "Class A";
    if (myint GTE 128 and myint LTE 191) return "Class B";
    if (myint GTE 192 and myint LTE 223) return "Class C";
    if (myint GTE 224 and myint LTE 239) return "Class D";
    if (myint GTE 240 and myint LTE 255) return "Class E";
}