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

Results forspf.dehostingfirma.nl

Resolver

Location

TXT

Name	TTL	Value
spf.dehostingfirma.nl	14400	v=spf1 mx ip6:2a02:990:173::1/48 ip4:37.247.41.0/24 ip4:45.91.122.0/24 ip4:178.18.137.224/27 ip4:178.18.143.64/26 ip4:37.247.35.192/27 ip4:37.247.39.32/27 ip4:77.243.226.0/28 ip4:77.243.237.32/29 ip4:94.103.157.128/27 ip4:94.103.159.0/25 ~all