Default Microsoft Active Directory Certificate Services URL

For my own reference (since I spent 30 minutes figuring this out and couldn’t find it documented anywhere) and to hopefully save someone else time.

After installing AD Certificate Services Web Enrollment, you need a URL to go to request and download certificates.  But, what is that default URL?

http://SERVERNAME/certsrv/en-us

Where SERVERNAME is where the AD CS Web Enrollment is installed.