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

Results for*.trailbot.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-02-10T20:56:33.207	2020-02-06T00:00:00	2021-02-06T12:00:00	trailbot.com	*.trailbot.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-02-10T20:56:33.207	2020-02-06T00:00:00	2021-02-06T12:00:00	trailbot.com	*.trailbot.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-02-06T07:14:06.138	2020-02-06T00:00:00	2021-02-06T12:00:00	trailbot.com	*.trailbot.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-02-06T07:14:06.138	2020-02-06T00:00:00	2021-02-06T12:00:00	trailbot.com	*.trailbot.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1