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

Results forsmtp.freenom.net

Resolver

Location

A

Name	TTL	Value
smtp.freenom.net	300	66.240.205.149CariNet, Inc.
smtp.freenom.net	300	66.240.205.209CariNet, Inc.
smtp.freenom.net	300	66.240.205.210CariNet, Inc.
smtp.freenom.net	300	66.240.205.211CariNet, Inc.
smtp.freenom.net	300	71.6.186.80sysadmin@cari.net / CariNet, Inc.
smtp.freenom.net	300	209.126.132.85CariNet, Inc / CariNet, Inc.
smtp.freenom.net	300	216.75.58.148CariNet, Inc.