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

Results forapi.123abcnet.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-12-26T12:31:49.77	2020-12-26T11:31:49	2021-03-26T11:31:49	dev.api.123abcnet.com	dev.api.123abcnet.com	C=US, O=Let's Encrypt, CN=R3
2020-12-26T12:31:49.603	2020-12-26T11:31:49	2021-03-26T11:31:49	dev.api.123abcnet.com	dev.api.123abcnet.com	C=US, O=Let's Encrypt, CN=R3
2020-10-28T14:03:39.343	2020-10-28T13:03:39	2021-01-26T13:03:39	api.123abcnet.com	api.123abcnet.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-28T14:03:39.087	2020-10-28T13:03:39	2021-01-26T13:03:39	api.123abcnet.com	api.123abcnet.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-10T18:06:37.292	2020-07-10T17:06:36	2020-10-08T17:06:36	api.123abcnet.com	api.123abcnet.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-10T18:06:37.027	2020-07-10T17:06:36	2020-10-08T17:06:36	api.123abcnet.com	api.123abcnet.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3