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

Results forcorpmail.convio.com

Resolver

Location

TXT

Name	TTL	Value
corpmail.convio.com	600	spf2.0/pra +ip4:209.163.168.192/26 +ip4:208.7.109.0/24 +ip4:173.226.86.208/28 ~all
corpmail.convio.com	600	v=spf1 +ip4:209.163.168.192/26 +ip4:208.7.109.0/24 +ip4:173.226.86.208/28 ~all