Performs a full IP address match for logged in Admin CP users instead of the first three octets.
Author:thruska Submitted: 13th October 2008 Last Updated: 27th February 2010
This plugin supplements ADMIN_IP_SEGMENTS (a constant in admin/index.php)
by performing an exact match of the entire IPv4 address instead of just the
first three octets. Prevents users on the same Class D subnet from
hijacking access to the Admin CP.