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

Results forfjygsn.com.w.cdngslb.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-07-25T12:04:34.784	2021-07-25T11:04:34	2021-10-23T11:04:32	qiming.fjygsn.com.w.cdngslb.com	qiming.fjygsn.com.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-07-25T12:04:34.539	2021-07-25T11:04:34	2021-10-23T11:04:32	qiming.fjygsn.com.w.cdngslb.com	qiming.fjygsn.com.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-07-25T07:37:17.908	2021-07-25T06:37:17	2021-10-23T06:37:15	yunmao.fjygsn.com.w.cdngslb.com	yunmao.fjygsn.com.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-07-25T07:37:17.439	2021-07-25T06:37:17	2021-10-23T06:37:15	yunmao.fjygsn.com.w.cdngslb.com	yunmao.fjygsn.com.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-07-25T07:14:11.018	2021-07-25T06:14:10	2021-10-23T06:14:08	api.fjygsn.com.w.cdngslb.com	api.fjygsn.com.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-07-25T07:14:10.765	2021-07-25T06:14:10	2021-10-23T06:14:08	api.fjygsn.com.w.cdngslb.com	api.fjygsn.com.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3