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

Results forxxnmcjd.cn.w.cdngslb.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-10-31T08:54:32.985	2021-10-31T07:54:32	2022-01-29T07:54:31	ali2.xxnmcjd.cn.w.cdngslb.com	ali2.xxnmcjd.cn.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-10-31T08:54:32.799	2021-10-31T07:54:32	2022-01-29T07:54:31	ali2.xxnmcjd.cn.w.cdngslb.com	ali2.xxnmcjd.cn.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-10-31T08:53:56.03	2021-10-31T07:53:55	2022-01-29T07:53:54	ali2.xxnmcjd.cn.w.cdngslb.com	ali2.xxnmcjd.cn.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3
2021-10-31T08:53:55.788	2021-10-31T07:53:55	2022-01-29T07:53:54	ali2.xxnmcjd.cn.w.cdngslb.com	ali2.xxnmcjd.cn.w.cdngslb.com	C=US, O=Let's Encrypt, CN=R3