Where is my salesforce instance located and how to find out this?

https://ap16.lightning.force.com/lightning/setup/SetupOneHome/home

1. AP  (Asia specific)------login.salesforce.com

2. EU(Europe specific)-----login.salesforce.com

3. NA(North America specific)-----login.salesforce.com

4. CS(Use for sandbox)---------test.salesforce.com

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