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ying liuying liu 

sfdc url

I have a question about sfdc url.
Usually the address is like this :

I know cs5 is the host.
But when I access visualforce page the url will be changed to

Please help me explain what the c. means?

Thanks very much.
ShashankShashank (Salesforce Developers) 
The "c." is common for all visualforce URLs. It doesnt change with host, and is a standard part of the URL for any org on any instance/host.