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

Results forspf.pdrserv.com

Resolver

Location

TXT

Name	TTL	Value
spf.pdrserv.com	1800	v=spf1 ip4:80.233.176.8/30 ip4:80.233.176.16/30 ip4:80.233.244.128/28 ip4:80.233.244.144/29 ip4:194.19.246.64/28 ip4:194.19.246.96/29 ip4:51.75.153.76 ~all