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

Results fortest2.dev.wordpress.bitstudios.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-12-17T19:50:16.389	2019-12-17T18:50:16	2020-03-16T18:50:16	test2.dev.wordpress.bitstudios.com	test2.dev.wordpress.bitstudios.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-17T19:50:16.238	2019-12-17T18:50:16	2020-03-16T18:50:16	test2.dev.wordpress.bitstudios.com	test2.dev.wordpress.bitstudios.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-17T19:44:57.21	2019-12-17T18:44:56	2020-03-16T18:44:56	test2.dev.wordpress.bitstudios.com	test2.dev.wordpress.bitstudios.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-17T19:44:56.966	2019-12-17T18:44:56	2020-03-16T18:44:56	test2.dev.wordpress.bitstudios.com	test2.dev.wordpress.bitstudios.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3