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

Results forspf2.knipp.de

Resolver

Location

TXT

Name	TTL	Value
spf2.knipp.de	86400	v=spf1 ip4:195.253.23.190 ip6:2a01:5b0:0:3a::be ip4:195.253.23.178 ip6:2a01:5b0:0:3a::b2 ip6:2a01:5b0:0:29::0/64 ip4:195.253.54.4 ip4:195.253.2.54 ip6:2a01:5b0:0:25::36 ~all