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

Results forwww.socket.giottus.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-05-24T05:48:17.543	2021-05-24T00:00:00	2022-06-23T23:59:59	socket.giottus.com	www.socket.giottus.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2021-05-24T05:48:17.008	2021-05-24T00:00:00	2022-06-23T23:59:59	socket.giottus.com	www.socket.giottus.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-06-03T16:00:31.273	2020-06-03T00:00:00	2021-06-03T23:59:59	socket.giottus.com	www.socket.giottus.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-06-03T16:00:30.814	2020-06-03T00:00:00	2021-06-03T23:59:59	socket.giottus.com	www.socket.giottus.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA