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

Results for_spf.dk-hostmaster.dk

Resolver

Location

TXT

Name	TTL	Value
_spf.dk-hostmaster.dk	600	v=spf1 mx:dk-hostmaster.dk ip4:95.130.209.224/28 ip6:2a01:630:0:78::/64 ip4:193.163.102.144/29 ip6:2a01:630:0:79::/64 include:spf.protection.outlook.com