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

Results for*.skialabs.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-05-27T22:22:55.929	2020-05-27T00:00:00	2021-05-27T23:59:59	*.skialabs.com	*.skialabs.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-05-27T22:22:55.929	2020-05-27T00:00:00	2021-05-27T23:59:59	*.skialabs.com	*.skialabs.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-05-27T22:22:55.608	2020-05-27T00:00:00	2021-05-27T23:59:59	*.skialabs.com	*.skialabs.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-05-27T22:22:55.608	2020-05-27T00:00:00	2021-05-27T23:59:59	*.skialabs.com	*.skialabs.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA