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

Results fortest.memoryoptimization.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-09-23T06:11:11.235	2025-09-23T05:12:40	2025-12-22T05:12:39	test.memoryoptimization.com	test.memoryoptimization.com	C=US, O=Let's Encrypt, CN=R13
2025-09-23T06:11:10.927	2025-09-23T05:12:40	2025-12-22T05:12:39	test.memoryoptimization.com	test.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