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are there different URL's to login into different sandboxes like developer,developer pro,partial sanbox?if so please let me know the URL's?
No. When logging to a sandbox, use the test.salesforce.com URL; your user credential (it contains the sandbox name) will identify both the sandbox for your org, and direct you to the server your org's sandbox resides on. The only exception may be if your org is configured with a 'mydomain' feature.