Hi Anuj,
When you access the Custom list column in site for edit, It gets the internal name with the list GUID. I am not really sure about how to get the GUID on UI but there is an alternate using the SharePoint manager or using the powershell.
Here is the sample with code & screenshot:
http://gallery.technet.microsoft.com/Server-2010-Powershell-Get-4eb3bbba
using SPM:
http://spm.codeplex.com/
Hope that helps.
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