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

Results forspf1.gurucul.com

Resolver

Location

TXT

Name	TTL	Value
spf1.gurucul.com	1800	v=spf1 ip4:34.202.174.188 ip4:34.199.167.230 ip4:52.203.5.138 ip4:3.91.171.64/28 ip4:3.219.176.96/29 ip4:3.222.0.0/24 ip4:3.235.255.160/29 ip4:18.235.53.110 ip4:54.159.173.91 ip4:35.158.71.15 ip4:35.158.67.243 include:spf2.gurucul.com ~all