From the port number (4200) after the IP address it looks like he's using 'Shell in a box'
As has been mentioned, the address your router has assigned to your Pi has probably changed
If you can, log into your router and check the Devices page (difficult to describe exact name without more details on the router) and see if you can spot the Pi, either by it's name or is a list of MAC addresses is show, the one starting with B827 …..
There are a number of useful IP scanners you can get for free too - running one of these on your PC will list the devices is can find on your network (IP address, name, MAC address etc etc) -- handy if you're not sure where to look in your router..
Here's one I've used in the past ..
http://www.advanced-ip-scanner.com/index2.php?utm_expid=62919999-71.OuJ_66t8Q8SCz9BIvLvQ6g.1Cheers