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

Results for_block1.maropost.com

Resolver

Location

TXT

Name	TTL	Value
_block1.maropost.com	3600	v=spf1 ip4:162.247.112.0/21 ip4:168.235.224.0/20 ip4:209.133.224.0/19 ip4:104.239.180.0/26 ip4:65.61.143.197 ip4:65.61.143.198 ip4:65.61.143.199 ip4:65.61.143.196 -all