Capturing IP Address on user registration & login

I have a situation where I suspect members may be creating multiple accounts under different profile types to gain access to restricted forums. I would like to capture the user's IP address at registration as well as every time they log in to help identify when this may be happening.

I found this article on modifying the CB Login module to do this and adding a column to the backend. Before I go messing with code, I would like to know if 1) there's a better or easier way to do this and 2) if this method is something the CB team feels is valid.

solutionz.yolasite.com/web---joomla/how-get-ip-address-to-the-database-jos_users-table-in-joomla-community-builder-when-users-are-logging-

IP address is not a reliable way of tracking logins. For example I have 4 computers through a single router. This means all 4 have the same exact IP address (you can't see my local). So if 3 of the 4 login then you'll see 3 logins from the same IP address. This is majorly prominent if a user is logging in from an internet cafe, hotel internet, school campus, etc.. In addition to this I have a dynamic IP like most of the world so more or less on a weekly basis my IP changes (for all 4 computers). So if you track a single IP address all they need to do is reboot their modem and they've new address.

At any rate the best way to do this is develop an CB plugin to act on the login trigger then store the IP to database for a user. More on trigger usage in tutorials within my signature.