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

Results forwww.webmail.web.nermining.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-12-12T05:24:36.382	2021-12-12T04:24:36	2022-03-12T04:24:35	webmail.web.nermining.com	www.webmail.web.nermining.com	C=US, O=Let's Encrypt, CN=R3
2021-12-12T05:24:36.179	2021-12-12T04:24:36	2022-03-12T04:24:35	webmail.web.nermining.com	www.webmail.web.nermining.com	C=US, O=Let's Encrypt, CN=R3
2021-12-12T05:24:25.111	2021-12-12T04:24:24	2022-03-12T04:24:23	webmail.web.nermining.com	www.webmail.web.nermining.com	C=US, O=Let's Encrypt, CN=R3
2021-12-12T05:24:24.861	2021-12-12T04:24:24	2022-03-12T04:24:23	webmail.web.nermining.com	www.webmail.web.nermining.com	C=US, O=Let's Encrypt, CN=R3