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

Results forcatalog-dev.solutionmag.cloud

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-02-25T21:44:28.47	2019-02-25T20:44:27	2019-05-26T20:44:27	catalog-dev.solutionmag.cloud	catalog-dev.solutionmag.cloud	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-25T21:44:27.141	2019-02-25T20:44:27	2019-05-26T20:44:27	catalog-dev.solutionmag.cloud	catalog-dev.solutionmag.cloud	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-25T17:11:41.502	2019-02-25T16:11:40	2019-05-26T16:11:40	catalog-dev.solutionmag.cloud	catalog-dev.solutionmag.cloud	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-25T17:11:40.172	2019-02-25T16:11:40	2019-05-26T16:11:40	catalog-dev.solutionmag.cloud	catalog-dev.solutionmag.cloud	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3