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

Results for_spf.network.cz

Resolver

Location

TXT

Name	TTL	Value
_spf.network.cz	8400	v=spf1 ip4:81.91.84.116 ip6:2001:1568:b:145::1 ip6:2001:1568:b::145 ip4:87.236.199.38 ip6:2a01:5f0:c001:108:2::1 ip4:217.31.57.209 ip6:2001:1ab0:7e1e:d150::2:100 -all