It can be anything! An apex, subdomain, or even a URL.

Results forts.itechpr.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-01-25T17:51:34.281	2010-04-20T13:46:10	2011-04-20T04:33:54	mail.itechpr.com	ts.itechpr.com	C=US, ST=Arizona, L=Scottsdale, O="GoDaddy.com, Inc.", OU=http://certificates.godaddy.com/repository, CN=Go Daddy Secure Certification Authority, serialNumber=07969287
2016-10-01T19:02:40.977	2011-05-01T21:03:21	2013-04-20T04:33:54	mail.itechpr.com	ts.itechpr.com	C=US, ST=Arizona, L=Scottsdale, O="GoDaddy.com, Inc.", OU=http://certificates.godaddy.com/repository, CN=Go Daddy Secure Certification Authority, serialNumber=07969287
2016-09-26T18:26:57.902	2010-09-07T17:51:13	2011-04-20T04:33:54	mail.itechpr.com	ts.itechpr.com	C=US, ST=Arizona, L=Scottsdale, O="GoDaddy.com, Inc.", OU=http://certificates.godaddy.com/repository, CN=Go Daddy Secure Certification Authority, serialNumber=07969287