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

Results forspf-hk.qcloudmail.com

Resolver

Location

TXT

Name	TTL	Value
spf-hk.qcloudmail.com	600	v=spf1 ip4:101.32.0.0/16 ip4:119.28.0.0/16 ip4:124.156.0.0/16 ip4:129.226.0.0/16 ip4:150.109.0.0/16 ip4:43.128.0.0/16 ip4:43.129.0.0/16 ip4:43.132.0.0/16 ip4:43.135.0.0/16 ip4:101.33.0.0/16 ip4:43.134.0.0/16 ip4:43.156.0.0/16 ip4:103.86.0.0/16 ~all