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

Results forspf.mailhy.com

Resolver

Location

TXT

Name	TTL	Value
spf.mailhy.com	86400	v=spf1 ip4:72.55.185.113/28 ip4:67.205.65.49/28 ip4:70.38.59.41/28 ip4:67.205.79.145/28 ip4:72.55.139.233/28 ip4:64.15.131.96/26 ip4:192.241.190.48/32 ip4:45.55.229.253/32 ip4:45.55.236.0/32 ip4:162.243.39.218/32 ip4:103.52.183.0/24 -all