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

Results for_netblocks.act-on.net

Resolver

Location

TXT

Name	TTL	Value
_netblocks.act-on.net	86400	v=spf1 ip4:72.46.76.0/22 ip4:204.156.176.0/23 ip4:204.156.178.0/24 ip4:209.222.65.0/24 ip4:209.222.66.0/23 ip4:209.162.194.0/24 ip4:216.41.143.0/24 ip4:54.194.14.170 ip4:54.93.34.201 ip4:35.183.73.63 -all