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

Results forspf0101.titan.email

Resolver

Location

TXT

Name	TTL	Value
spf0101.titan.email	300	v=spf1 ip4:18.198.158.5 ip4:18.198.78.245 ip4:3.64.226.208/28 ip4:3.65.7.70 ip4:3.66.115.72 ip4:3.69.218.78 ip4:3.69.224.234 ip4:18.196.231.60 ip4:3.66.49.190 ip4:3.67.56.127 ip4:3.121.9.152 ip4:35.157.51.134 ip4:3.65.141.4 ip4:18.158.253.108 ip4:3.71.251.175 ip4:3.68.153.191 ip4:3.75.21.149 ~all