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

Results forspf.mailvox.it

Resolver

Location

TXT

Name	TTL	Value
spf.mailvox.it	600	v=spf1 ip4:188.165.188.0/25 ip4:213.171.189.0/26 ip4:94.177.191.160/27 ip4:193.169.20.28/30 ip4:193.169.20.32/28 ip4:193.169.20.48/29 ip4:193.169.20.56/30 ip4:94.76.211.128/27 ~all