IPC media

http://www.ipcmedia.com/brands/brands.php

I looked at this website because IPC media is one of the largest magazine production companies in the world. There are lots of different audiences targetted through the magazines that they produce; although many of them (e.g. Pick Me Up and Now) fit under the 'mass marketing' scene, they also produce magazines (e.g. Horse and Motor Boat) that are aimed at the 'niche' groups.
This will help me when I come to make my preliminary magazine, and my final magazine, because I can see how each magazine on the IPC media website clearly shows who the target audience is.