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

Results for*.atomictruthbomb.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-07-03T13:17:25.186	2019-07-01T00:00:00	2020-06-30T12:00:00	sni.cloudflaressl.com	*.atomictruthbomb.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-07-03T13:17:25.186	2019-07-01T00:00:00	2020-06-30T12:00:00	sni.cloudflaressl.com	*.atomictruthbomb.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-07-01T21:40:36.143	2019-07-01T00:00:00	2020-06-30T12:00:00	sni.cloudflaressl.com	*.atomictruthbomb.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-07-01T21:40:36.143	2019-07-01T00:00:00	2020-06-30T12:00:00	sni.cloudflaressl.com	*.atomictruthbomb.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2