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

Results for*.solve.vc

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-10-31T14:01:10.292	2020-10-22T00:00:00	2021-10-22T23:59:59	solve.vc	*.solve.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-10-31T14:01:10.292	2020-10-22T00:00:00	2021-10-22T23:59:59	solve.vc	*.solve.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-10-22T16:30:50.212	2020-10-22T00:00:00	2021-10-22T23:59:59	solve.vc	*.solve.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-10-22T16:30:50.212	2020-10-22T00:00:00	2021-10-22T23:59:59	solve.vc	*.solve.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1