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

Results for*.cefr.app

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-08-16T10:10:36.919	2020-08-07T00:00:00	2021-08-07T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-16T10:10:36.919	2020-08-07T00:00:00	2021-08-07T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-07T06:31:53.025	2020-08-07T00:00:00	2021-08-07T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-07T06:31:53.025	2020-08-07T00:00:00	2021-08-07T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-05-20T09:55:18.77	2020-04-09T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2020-05-20T09:55:18.77	2020-04-09T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2020-04-09T22:09:56.987	2020-04-09T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2020-04-09T22:09:56.987	2020-04-09T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.cefr.app	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2