If you are using the My Domain feature in Salesforce then the instance your organization uses will not appear in your Salesforce URL. This lesson shows you how to determine which instance your organization is on.
Go to http://trust.salesforce.com
http://trust.salesforce.com provides a means of looking up your organization's instance.
Click on the System Status button.
Enter your My Domain custom domain into the field (1) and click Find (2). Your instance will appear below. In this example the instance is NA3 (3).
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