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

Results forwww.help.appsonomy.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-10-08T03:48:16.66	2020-10-08T02:48:16	2021-01-06T02:48:16	www.help.appsonomy.com	www.help.appsonomy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-08T03:48:16.458	2020-10-08T02:48:16	2021-01-06T02:48:16	www.help.appsonomy.com	www.help.appsonomy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-08T00:58:03.298	2020-08-07T23:58:02	2020-11-05T23:58:02	*.appsonomy.com	www.help.appsonomy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-08T00:58:03.079	2020-08-07T23:58:02	2020-11-05T23:58:02	*.appsonomy.com	www.help.appsonomy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-07T22:09:34.845	2020-06-07T21:09:34	2020-09-05T21:09:34	www.help.appsonomy.com	www.help.appsonomy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-07T22:09:34.697	2020-06-07T21:09:34	2020-09-05T21:09:34	www.help.appsonomy.com	www.help.appsonomy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3