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

Results forspf-ec.sk.com

Resolver

Location

TXT

Name	TTL	Value
spf-ec.sk.com	300	v=spf1 ip4:203.235.240.64/30 ip4:168.187.214.227 ip4:52.78.182.179 ip4:203.235.226.14/31 ip4:203.235.226.46/31 ip4:3.35.188.137 ip4:3.36.241.231 ip4:13.124.169.250 ip4:43.200.50.169 ip4:203.235.209.149 ip4:203.235.209.150 ip4:3.39.142.179 ~all