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

Results for*.sta.vc

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-02-21T19:04:54.687	2021-02-21T00:00:00	2022-02-21T23:59:59	sta.vc	*.sta.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-02-21T19:04:54.687	2021-02-21T00:00:00	2022-02-21T23:59:59	sta.vc	*.sta.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-08-21T13:34:06.035	2020-08-21T00:00:00	2021-08-21T12:00:00	sni.cloudflaressl.com	*.sta.vc	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-21T13:34:06.035	2020-08-21T00:00:00	2021-08-21T12:00:00	sni.cloudflaressl.com	*.sta.vc	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3