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

Results forcert.spur.dev

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-12-01T18:08:00.855	2025-12-01T17:09:30	2026-03-01T17:09:29	test.cert.spur.dev	test.cert.spur.dev	C=US, O=Let's Encrypt, CN=E8
2025-12-01T18:08:00.552	2025-12-01T17:09:30	2026-03-01T17:09:29	test.cert.spur.dev	test.cert.spur.dev	C=US, O=Let's Encrypt, CN=E8
2019-04-30T14:40:49.202	2019-04-30T13:40:48	2019-07-29T13:40:48	*.spur.dev	*.spur.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-30T14:40:48.256	2019-04-30T13:40:48	2019-07-29T13:40:48	*.spur.dev	*.spur.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-01T15:13:40.879	2019-03-01T14:13:40	2019-05-30T14:13:40	*.spur.dev	*.spur.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-01T15:13:40.132	2019-03-01T14:13:40	2019-05-30T14:13:40	*.spur.dev	*.spur.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3