cidrToNetMask(cidr)
Last updated July 19, 2005
Version: 1 | Requires: ColdFusion 5 | Library: NetLib
Description:
CIDR numbers such as /24,/32,/12 are converted to the appropiate netmask address form.
Return Values:
Returns a string.
Example:
#cidrToNetMask(12)#<br>
Parameters:
| Name | Description | Required |
|---|---|---|
| cidr | CIDR number. | Yes |
Full UDF Source:
<cfscript>
/**
* Converts CIDR numbers to valid network mask numbers.
*
* @param cidr CIDR number. (Required)
* @return Returns a string.
* @author Sufiyan bin Yasa (cinod_79@yahoo.com)
* @version 1, July 19, 2005
*/
function cidrToNetMask (cidr) {
var netMask = "";
var post = 0;
var remainder = cidr MOD 8;
var divide = cidr \ 8;
while(divide gt 0) {
netMask = listAppend(netMask, 255,'.');
divide = divide - 1;
post = post + 1;
}
if(remainder gt 0) {
netMask = listAppend(NetMask,
bitSHLN(BitOr(0,2^remainder-1), 8-remainder),
'.');
post = post +1;
}
while(post lt 4) {
netMask = listAppend(netMask, "0",'.');
post = post + 1;
}
if(right(netMask, 1) eq "."){
netMask = left(netMask,len(netMask));
}
return netMask;
}
</cfscript>
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