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

Results forspf4.septacode.com

Resolver

Location

TXT

Name	TTL	Value
spf4.septacode.com	1800	v=spf1 ip4:223.165.115.0/24 ip4:223.165.118.0/23 ip4:223.165.120.0/23 ip4:23.253.182.0/23 ip4:40.107.0.0/16 ip4:40.92.0.0/15 ip4:50.31.32.0/19 ip4:52.100.0.0/15 ip4:52.102.0.0/16 ip4:52.103.0.0/17 ip4:69.72.32.0/20 include:spf5.septacode.com ~all