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

Results for*.appbuttons.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-12-18T12:58:48.046	2018-12-13T00:00:00	2019-12-13T12:00:00	sni.cloudflaressl.com	*.appbuttons.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-12-18T12:58:48.046	2018-12-13T00:00:00	2019-12-13T12:00:00	sni.cloudflaressl.com	*.appbuttons.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-12-13T07:58:50.815	2018-12-13T00:00:00	2019-12-13T12:00:00	sni.cloudflaressl.com	*.appbuttons.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-12-13T07:58:50.815	2018-12-13T00:00:00	2019-12-13T12:00:00	sni.cloudflaressl.com	*.appbuttons.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2