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

Results forspfc.server-he.de

Resolver

Location

TXT

Name	TTL	Value
spfc.server-he.de	86400	v=spf1 ip4:178.77.104.0/21 ip4:92.51.170.64/27 ip4:178.77.112.0/21 ip4:80.67.16.0/20 ip4:134.119.228.0/19 ip6:2a00:1158:400:1::/120 ip6:2a01:488::/32 ip4:91.216.90.0/24 -all