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

Results for*.performanceoptimization.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2023-01-17T18:07:56.269	2023-01-17T17:07:55	2023-04-17T17:07:54	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2023-01-17T18:07:56.269	2023-01-17T17:07:55	2023-04-17T17:07:54	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2023-01-17T18:07:56.024	2023-01-17T17:07:55	2023-04-17T17:07:54	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2023-01-17T18:07:56.024	2023-01-17T17:07:55	2023-04-17T17:07:54	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T16:06:25.313	2022-11-18T15:06:24	2023-02-16T15:06:23	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T16:06:25.313	2022-11-18T15:06:24	2023-02-16T15:06:23	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T16:06:24.612	2022-11-18T15:06:24	2023-02-16T15:06:23	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T16:06:24.612	2022-11-18T15:06:24	2023-02-16T15:06:23	performanceoptimization.com	*.performanceoptimization.com	C=US, O=Let's Encrypt, CN=R3