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

Results forapi.mojito.appydrinking.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-06-19T13:12:49.282	2019-06-19T12:12:48	2019-09-17T12:12:48	mojito.appydrinking.com	api.mojito.appydrinking.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-19T13:12:48.735	2019-06-19T12:12:48	2019-09-17T12:12:48	mojito.appydrinking.com	api.mojito.appydrinking.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-17T10:22:50.501	2019-06-17T09:22:49	2019-09-15T09:22:49	api.mojito.appydrinking.com	api.mojito.appydrinking.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-17T10:22:49.878	2019-06-17T09:22:49	2019-09-15T09:22:49	api.mojito.appydrinking.com	api.mojito.appydrinking.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3