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

Results for_spf.mailforward.net

Resolver

Location

TXT

Name	TTL	Value
_spf.mailforward.net	300	v=spf1 ip4:5.78.45.44 ip4:23.239.20.33 ip4:23.239.3.185 ip4:45.79.111.47 ip6:2600:3c01::f03c:93ff:fe23:971e ip6:2600:3c01::f03c:93ff:fe52:0934 -all