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

Results for_spf02.mailplug.com

Resolver

Location

TXT

Name	TTL	Value
_spf02.mailplug.com	100	v=spf1 ip4:223.130.174.82 ip4:223.130.174.102 ip4:175.45.214.223 ip4:175.45.214.224 ip4:175.45.221.5 ip4:175.45.221.162 ip4:175.45.220.31 ip4:175.45.220.53 ~all