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

Results forcom.commit.vc

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-11-04T23:03:15.609	2022-11-04T22:03:14	2023-02-02T22:03:13	squirt8k.com.niehash.com.commit.vc	squirt8k.com.niehash.com.commit.vc	C=US, O=Let's Encrypt, CN=R3
2022-11-04T23:03:14.811	2022-11-04T22:03:14	2023-02-02T22:03:13	squirt8k.com.niehash.com.commit.vc	squirt8k.com.niehash.com.commit.vc	C=US, O=Let's Encrypt, CN=R3
2022-09-01T06:24:34.148	2022-09-01T05:24:33	2022-11-30T05:24:32	ozonosphere.com.commit.vc	ozonosphere.com.commit.vc	C=US, O=Let's Encrypt, CN=R3
2022-09-01T06:24:33.798	2022-09-01T05:24:33	2022-11-30T05:24:32	ozonosphere.com.commit.vc	ozonosphere.com.commit.vc	C=US, O=Let's Encrypt, CN=R3