Adobe Sign is a distributed application, spanning multiple instances around the globe.
Each instance is tightly integrated with all of the others, ensuring seemless transactions between Senders and Recipients, regardless as to which instance each resides in.
However, occasionally it becomes important to know which instance contains your account. During maintenance or upgrade windows for example.
To find which instance holds your account, just log in to Adobe Sign, and check the URL.
The instance is found in the address, just before the echosign.com portion.