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

Results forsmtp.smartertools.com

Resolver

Location

A

Name	TTL	Value
smtp.smartertools.com	60	35.199.160.255Google Cloud (us-west1) / Google LLC

Name	TTL	Value
smtp.smartertools.com	60	v=spf1 ip4:35.199.160.255 ip4:34.82.151.223 ip4:35.197.76.75 ip4:34.169.160.163 ip4:35.247.73.164 ip4:34.19.22.181 ip4:35.247.116.72 ip4:98.185.70.250 ip4:98.185.70.251 ip4:98.185.70.252 ip4:98.185.70.253 ip4:98.185.70.254 ip4:68.15.153.34 ip4:68.15.153.3 5 ip4:68.15.153.36 ip4:68.15.153.37 ip4:68.15.153.38 ip4:68.15.151.107 ip4:68.15.151.108 ip4:68.15.151.109 ip4:68.15.151.110 ip4:68.15.151.111 ~all