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

Results forlower-bb.api.codeworld.io

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-08-21T00:59:37.206	2021-08-21T00:00:00	2022-08-20T23:59:59	lower-bb.api.codeworld.io	lower-bb.api.codeworld.io	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2021-08-21T00:59:36.266	2021-08-21T00:00:00	2022-08-20T23:59:59	lower-bb.api.codeworld.io	lower-bb.api.codeworld.io	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc RSA CA-2
2021-08-20T20:42:32.58	2021-08-20T00:00:00	2022-08-19T23:59:59	lower-bb.api.codeworld.io	lower-bb.api.codeworld.io	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2021-08-20T20:42:31.522	2021-08-20T00:00:00	2022-08-19T23:59:59	lower-bb.api.codeworld.io	lower-bb.api.codeworld.io	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc RSA CA-2
2021-08-19T04:07:21.823	2021-08-19T00:00:00	2022-08-18T23:59:59	lower-bb.api.codeworld.io	lower-bb.api.codeworld.io	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2021-08-19T04:07:20.904	2021-08-19T00:00:00	2022-08-18T23:59:59	lower-bb.api.codeworld.io	lower-bb.api.codeworld.io	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc RSA CA-2