Understanding Subnetting

In order to understand subnet masks, you MUST understand binary.   If you already have a basic understanding of binary, you can skip ahead to the “Networks and Subnetting” section further down below.

Understanding Binary

The math that you and I and every other person on the planet uses in our day-to-day activities is base-10.  This means our number system is based on 10 individual digits, 0 through 9, and subsequently powers of 10.

Lets take the number one hundred twenty three (123).  It has three “places”, the hundreds place, the tens place, and the ones place.  Simple, I know, but it is necessary to relate to binary.  In the hundreds place, we have the value of 1, the tens place a value of 2, and the ones place a value of 3.

Now we get to the fun part.  The hundreds, tens, and ones place are more technically the 10^2 place, 10^1 place, and 10^0 place (that’s ten to the power of 2, etc.).  Ten to the power of 2 is 100, to the power of 1 is 10, and to the power of 0 is 1 (anything to the power of 0 is 1).So what this means, is that for every place, the value added to the final number is the number in that place, times the appropriate 10^x.  In this example, then:

(1 * 10^2) = 1 * 100 = 100
(2 * 10^1) = 2 * 10  =  20
(3 * 10^0) = 3 * 1   =   3

SMF Mod: SFS Anti-Spam Registration

The SFS Anti-Spam Registration Mod is a modification for SMF (tested 1.1.11, 1.1.12) that interfaces with the stopforumspam.com API to verify user details during registration.  If the API returns any hits from the blacklist on the user IP, email address, or username, registration is prevented and logged in the forum error log.

phpBB3 Mod: SFS Anti-Spam Registration

The SFS Anti-Spam Registration Mod is a modification for phpBB3 (tested 3.0.3, 3.04) that interfaces with the stopforumspam.com API to verify user details during registration.  If the API returns any hits from the blacklist on the user IP, email address, or username, registration is prevented.  This mod requires php5.