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

Results forspf.odiso.net

Resolver

Location

TXT

Name	TTL	Value
spf.odiso.net	3600	v=spf1 ip4:185.57.148.0/22 ip4:193.108.31.0/24 ip4:194.31.195.0/24 ip4:89.248.208.0/20 ip4:185.151.188.0/22 ip4:84.247.62.0/24 ip4:185.251.132.0/22 ip4:37.148.252.0/22 ip4:62.210.206.54/32 ip6:2a0a:1580::/29 ip6:2a05:71c0::/29 include:spf.protection.outl ook.com ~all