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

Results forwww.express-editor-staging.dotster.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-07-18T13:31:19.598	2021-07-18T00:00:00	2022-07-17T23:59:59	sni.cloudflaressl.com	express-editor-staging.dotster.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2021-07-18T13:31:18.372	2021-07-18T00:00:00	2022-07-17T23:59:59	sni.cloudflaressl.com	express-editor-staging.dotster.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc RSA CA-2
2021-06-17T17:58:23.126	2020-08-18T00:00:00	2021-08-18T12:00:00	sni.cloudflaressl.com	express-editor-staging.dotster.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-18T20:48:38.972	2020-08-18T00:00:00	2021-08-18T12:00:00	sni.cloudflaressl.com	express-editor-staging.dotster.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-18T20:48:37.793	2020-08-18T00:00:00	2021-08-18T12:00:00	sni.cloudflaressl.com	express-editor-staging.dotster.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc RSA CA-2