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

Results for*.altthread.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-09-18T11:18:55.724	2019-09-16T00:00:00	2020-09-15T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-09-18T11:18:55.724	2019-09-16T00:00:00	2020-09-15T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-09-16T12:45:14.469	2019-09-16T00:00:00	2020-09-15T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-09-16T12:45:14.469	2019-09-16T00:00:00	2020-09-15T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-10-20T18:37:07.723	2018-10-17T00:00:00	2019-10-17T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-10-20T18:37:07.723	2018-10-17T00:00:00	2019-10-17T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-10-17T13:18:43.767	2018-10-17T00:00:00	2019-10-17T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-10-17T13:18:43.767	2018-10-17T00:00:00	2019-10-17T12:00:00	sni.cloudflaressl.com	*.altthread.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2