BinSubnetMask ( CIDR )

Generate a binary subnet mask from CIDR

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Hamlin - Show more from this author

Sample input:

BinSubnetMask(24)

Sample output:

11111111111111111111111100000000

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/* Name: BinSubnetMask(CIDR)

01.20.2021 Version 1.1
==================================
Author:  Hamlin 
Contact: hkrewson at gmail dot com
==================================

The function takes CIDR as either a.b.c.d/n, or n and generates a binary number to represent the network's subnet mask. 

*/

Let 
    ( 
        [
        getCIDR = Case 
                            ( CIDR = "0.0.0.0"; 1; 
                            CIDR = "128.0.0.0"; 2; 
                            CIDR = "192.0.0.0"; 3; 
                            CIDR = "224.0.0.0"; 4; 
                            CIDR = "240.0.0.0"; 4;
                            Right ( CIDR ; Length ( CIDR ) -  Position ( CIDR ; "/" ; 0 ; 1 )  ) ) 
        ] ; 
While (
 [ 
    count = getCIDR;
    result = ""
 ] ;
 count > 0 ;
 [
 result = result & "1";
 count = count -1
 ] ;
 result ) &

While (
 [ 
    count = 32 - getCIDR;
    result = ""
 ] ;
 count > 0 ;
 [
 result = result & "0";
 count = count -1
 ] ;
 result ))

The function takes CIDR as either a.b.c.d/n, or n and generates a binary number to represent the network's subnet mask.

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Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

BinSubnetMask ( CIDR )

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