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

Results for_netspf.readyplanet.com

Resolver

Location

TXT

Name	TTL	Value
_netspf.readyplanet.com	300	v=spf1 ip4:54.179.102.156 ip4:3.1.67.54 ip4:54.254.16.10 ip4:13.250.251.69 ip4:54.254.254.105 ip4:54.255.191.200 ip4:18.138.157.237 ip4:13.228.59.88 ip4:18.139.35.104 ip4:3.1.188.42 ?all