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

Results for_spf.noip.com

Resolver

Location

TXT

Name	TTL	Value
_spf.noip.com	300	v=spf1 ip4:204.16.252.0/24 ip4:8.23.224.0/24 ip4:69.65.5.96/27 ip4:69.65.19.112/28 ip4:158.247.7.0/24 ip4:216.40.42.0/24 ip4:216.40.44.0/24 ip4:64.98.38.0/24 ip4:64.98.42.0/24 ip6:2001:1900:221E::/48 -all