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

Results forspfcontrol.mailgrid.net.br

Resolver

Location

TXT

Name	TTL	Value
spfcontrol.mailgrid.net.br	300	v=spf1 ip4:35.169.184.69 ip4:44.198.89.232 ip4:51.222.110.3 ip4:54.39.143.39 ip4:18.229.34.136 ip4:54.94.206.174 ip4:18.228.209.165 ip4:66.70.255.58 ip4:18.230.12.69 ip4:66.70.164.240 ip4:66.70.164.241 ip4:142.44.199.14 include:spf11.mailgrid.net.br -all