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

Results foraccount.memoryoptimization.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-18T00:37:24.045	2025-11-17T23:38:53	2026-02-15T23:38:52	account.memoryoptimization.com	account.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R13
2025-11-18T00:37:23.96	2025-11-17T23:38:53	2026-02-15T23:38:52	account.memoryoptimization.com	account.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R13
2023-01-17T17:16:17.47	2023-01-17T16:16:17	2023-04-17T16:16:16	memoryoptimization.com	*.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R3
2023-01-17T17:16:17.272	2023-01-17T16:16:17	2023-04-17T16:16:16	memoryoptimization.com	*.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T15:16:22.459	2022-11-18T14:16:21	2023-02-16T14:16:20	memoryoptimization.com	*.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T15:16:22.081	2022-11-18T14:16:21	2023-02-16T14:16:20	memoryoptimization.com	*.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R3