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

Results forhostmaster.writelify.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-08-21T19:59:27.356	2019-08-18T00:00:00	2020-08-17T12:00:00	sni.cloudflaressl.com	*.writelify.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-18T12:34:55.543	2019-08-18T00:00:00	2020-08-17T12:00:00	sni.cloudflaressl.com	*.writelify.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-09-23T00:52:05.35	2018-09-18T00:00:00	2019-09-18T12:00:00	sni.cloudflaressl.com	*.writelify.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-09-18T10:14:36.251	2018-09-18T00:00:00	2019-09-18T12:00:00	sni.cloudflaressl.com	*.writelify.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2