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

Results for*.silentrabbit.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-02-04T20:56:03.394	2019-02-01T00:00:00	2020-02-01T12:00:00	sni.cloudflaressl.com	*.silentrabbit.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-02-04T20:56:03.394	2019-02-01T00:00:00	2020-02-01T12:00:00	sni.cloudflaressl.com	*.silentrabbit.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-02-01T08:50:16.234	2019-02-01T00:00:00	2020-02-01T12:00:00	sni.cloudflaressl.com	*.silentrabbit.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-02-01T08:50:16.234	2019-02-01T00:00:00	2020-02-01T12:00:00	sni.cloudflaressl.com	*.silentrabbit.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2