Finding the GUID for a SharePoint List

+ Navigate to List Settings -
+ Copy the Url from the browser address bar into Notepad. It will look something like:
 http://portal/sites/projectest /_layouts/listedit.aspx?List=%7B47CCC9C7%2D4D5A%2D47CB%2D920C%2DB64B4C16F16D%7D
+ Delete everything before and including “List=”.

• Change “%7B” to “{” 
• Change all “%2D” to “-“
• Change “%7D” to “}”

You are now left with the GUID:
{47CCC9C7-4D5A-47CB-920C-B64B4C16F16D}