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

Results forspf2.fangmail.net

Resolver

Location

TXT

Name	TTL	Value
spf2.fangmail.net	600	v=spf1 ip4:221.122.112.0/24 ip4:61.145.163.0/24 ip4:103.243.180.140 ip4:122.112.226.138 ip4:47.254.32.63 ip4:101.71.240.0/24 ip4:119.13.90.109 ip4:121.91.173.228 -all