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

Results forspf2.gcore.lu

Resolver

Location

TXT

Name	TTL	Value
spf2.gcore.lu	300	v=spf1 ip4:185.12.240.252/30 ip4:92.223.127.242/32 ip4:185.12.243.43/32 ip4:92.223.127.229/32 ip4:92.223.20.254/32 ip4:5.189.220.175/32 ip4:193.57.88.104/32 ip4:85.234.65.89/32 -all