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

Results forapi3.vmtask03.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-11-18T07:04:48.995	2019-11-18T06:04:48	2020-02-16T06:04:48	api3.vmtask03.com	api3.vmtask03.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-11-18T07:04:48.868	2019-11-18T06:04:48	2020-02-16T06:04:48	api3.vmtask03.com	api3.vmtask03.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-15T15:25:01.574	2019-01-15T14:25:01	2019-04-15T14:25:01	vmtask03.com	*.vmtask03.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-15T15:25:01.033	2019-01-15T14:25:01	2019-04-15T14:25:01	vmtask03.com	*.vmtask03.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-10-17T16:07:19.829	2018-10-17T15:07:19	2019-01-15T15:07:19	vmtask03.com	*.vmtask03.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-10-17T16:07:19.121	2018-10-17T15:07:19	2019-01-15T15:07:19	vmtask03.com	*.vmtask03.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3