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

Results forspf.artif.net

Resolver

Location

TXT

Name	TTL	Value
spf.artif.net	7200	v=spf1 a:ip2.artif-webmail.de a:artif-webmail.de ip4:138.201.139.16 ip4:138.201.125.3 ip4:78.47.101.158 -all