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

Results formail.aa.net.uk

Resolver

Location

A

Name	TTL	Value
mail.aa.net.uk	3321	90.155.62.20AAISP / Andrews & Arnold Ltd
mail.aa.net.uk	3321	90.155.62.21AAISP / Andrews & Arnold Ltd

Name	TTL	Value
mail.aa.net.uk	2316	2001:8b0:0:62::20AAISP / Andrews & Arnold Ltd
mail.aa.net.uk	2316	2001:8b0:0:62::21AAISP / Andrews & Arnold Ltd

Name	TTL	Value
mail.aa.net.uk	3600	auth.primary-dns.co.uk
mail.aa.net.uk	3600	auth.secondary-dns.co.uk

Name	TTL	Value
mail.aa.net.uk	3600	auth.primary-dns.co.uk support.aa.net.uk 1766286131 10800 3600 1209600 600