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

Results forspf3.exacthosting.com

Resolver

Location

TXT

Name	TTL	Value
spf3.exacthosting.com	1200	v=spf1 ip4:208.84.65.9 ip4:208.86.201.9 ip4:209.235.151.0/24 ip4:209.235.156.128/25 ip4:209.59.177.160 ip4:209.59.190.0/23 ip4:216.200.145.0/26 ip4:216.55.172.0/24 ip4:50.28.1.0/24 ip4:66.70.126.15 ip4:67.225.0.0/16 ~all