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

Results for_spfmain.unbk.me

Resolver

Location

TXT

Name	TTL	Value
_spfmain.unbk.me	300	v=spf1 ip4:176.96.139.85 ip4:103.241.51.217 ip4:194.164.204.37 ip4:45.84.197.168 ip4:45.151.241.151 ip6:2a0d:5940:43:f6::/64 ip6:2a0a:51c1:000a:00ec::/64 ip6:2a01:239:410:2100::1/64 ip6:2a0f:6284:4300:165::468f/64 ip6:2a00:c380:e002:b792::c0de:2525 ~all