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

Results forspf.filtermail.eu

Resolver

Location

A

Name	TTL	Value
spf.filtermail.eu	3600	93.94.228.134Cyso Hosting B.V. / Cyso Hosting B.V
spf.filtermail.eu	3600	185.165.242.43Worldstream / WorldStream B.V.

Name	TTL	Value
spf.filtermail.eu	3600	2a00:7c80:0:1eb::2WorldStream B.V.
spf.filtermail.eu	3600	2a01:518:1:42:8::134Cyso Hosting B.V / Cyso Group B.V

Name	TTL	Value
spf.filtermail.eu	3600	v=spf1 ip4:185.165.242.217 ip4:185.165.242.43 ip6:2a00:7c80:0:1eb::2 ip4:93.94.228.134 ip6:2a01:518:1:42:8::134 ip4:93.94.228.136 ip6:2a01:518:1:42:8::136 ip4:93.94.228.137 ip6:2a01:518:1:42:8::137 ~all