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

Results forwww.kubectl.ws-us-east-k8s.afilias.tech

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-06-23T15:41:12.831	2020-06-23T14:41:12	2020-09-21T14:41:12	kubectl.ws-us-east-k8s.afilias.tech	kubectl.ws-us-east-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-23T15:41:12.657	2020-06-23T14:41:12	2020-09-21T14:41:12	kubectl.ws-us-east-k8s.afilias.tech	kubectl.ws-us-east-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-24T16:40:50.277	2020-04-24T15:40:49	2020-07-23T15:40:49	kubectl.ws-us-east-k8s.afilias.tech	kubectl.ws-us-east-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-24T16:40:50.053	2020-04-24T15:40:49	2020-07-23T15:40:49	kubectl.ws-us-east-k8s.afilias.tech	kubectl.ws-us-east-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-22T09:04:40.697	2020-04-22T08:04:40	2020-07-21T08:04:40	kubectl.ws-us-east-k8s.afilias.tech	kubectl.ws-us-east-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-22T09:04:40.531	2020-04-22T08:04:40	2020-07-21T08:04:40	kubectl.ws-us-east-k8s.afilias.tech	kubectl.ws-us-east-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3