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

Results for*.mymp4.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-04-06T04:35:47.056	2021-07-29T00:00:00	2022-07-29T23:59:59	mymp4.com	*.mymp4.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2022-04-06T04:35:47.056	2021-07-29T00:00:00	2022-07-29T23:59:59	mymp4.com	*.mymp4.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-07-29T10:10:40.574	2021-07-29T00:00:00	2022-07-29T23:59:59	mymp4.com	*.mymp4.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-07-29T10:10:40.574	2021-07-29T00:00:00	2022-07-29T23:59:59	mymp4.com	*.mymp4.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1