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

Results forspf1.regence.com

Resolver

Location

TXT

Name	TTL	Value
spf1.regence.com	300	v=spf1 ip4:161.208.26.120 ip4:161.208.150.192 ip4:161.208.150.193 ip4:161.208.25.141 ip4:161.208.26.92 ip4:161.208.150.81 ip4:161.208.26.84 ip4:161.208.150.48 ip4:161.208.150.50 -all