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

Results for_spf.openbusiness.com

Resolver

Location

TXT

Name	TTL	Value
_spf.openbusiness.com	3600	v=spf1 a:mail.swisslink.ch ip4:94.103.96.0/20 ip4:109.234.108.151 ip4:109.234.108.152 ip4:109.234.111.22 ip6:2a00:a500:0:93::90 ip6:2a00:a500:0:93::76 ip4:62.220.128.61 ip6:2001:788:2:125:62:220:128:61 -all