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

Results for*.knobstick.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-08-24T19:21:57.749	2020-08-20T00:00:00	2021-08-21T12:00:00	knobstick.com	*.knobstick.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-08-24T19:21:57.749	2020-08-20T00:00:00	2021-08-21T12:00:00	knobstick.com	*.knobstick.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-08-20T08:30:28.936	2020-08-20T00:00:00	2021-08-21T12:00:00	knobstick.com	*.knobstick.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-08-20T08:30:28.936	2020-08-20T00:00:00	2021-08-21T12:00:00	knobstick.com	*.knobstick.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1