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

Results forwww.webmail.mastersofwords.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-04-09T02:42:53.127	2025-04-09T01:44:20	2025-07-08T01:44:19	www.webmail.mastersofwords.com	www.webmail.mastersofwords.com	C=US, O=Let's Encrypt, CN=R11
2025-04-09T02:42:50.82	2025-04-09T01:44:20	2025-07-08T01:44:19	www.webmail.mastersofwords.com	www.webmail.mastersofwords.com	C=US, O=Let's Encrypt, CN=R11
2021-08-19T06:13:41.94	2021-08-19T05:13:41	2021-11-17T05:13:39	www.webmail.mastersofwords.com	www.webmail.mastersofwords.com	C=US, O=Let's Encrypt, CN=R3
2021-08-19T06:13:41.636	2021-08-19T05:13:41	2021-11-17T05:13:39	www.webmail.mastersofwords.com	www.webmail.mastersofwords.com	C=US, O=Let's Encrypt, CN=R3