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

Results for*.teamwork.sirfstudy.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-02-22T12:53:15.64	2021-02-22T11:53:15	2021-05-23T11:53:15	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:53:15.64	2021-02-22T11:53:15	2021-05-23T11:53:15	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:53:15.483	2021-02-22T11:53:15	2021-05-23T11:53:15	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:53:15.483	2021-02-22T11:53:15	2021-05-23T11:53:15	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:41:23.882	2021-02-22T11:41:23	2021-05-23T11:41:23	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:41:23.882	2021-02-22T11:41:23	2021-05-23T11:41:23	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:41:23.119	2021-02-22T11:41:23	2021-05-23T11:41:23	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3
2021-02-22T12:41:23.119	2021-02-22T11:41:23	2021-05-23T11:41:23	teamwork.sirfstudy.com	*.teamwork.sirfstudy.com	C=US, O=Let's Encrypt, CN=R3