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

Results fornetblock.romarg.net

Resolver

Location

TXT

Name	TTL	Value
netblock.romarg.net	30	v=spf1 ip4:89.42.222.0/24 ip4:86.106.30.0/24 ip4:86.105.214.0/24 ip4:188.215.2.0/24 ip4:188.214.215.0/24 ip4:188.213.205.0/24 ip4:188.209.214.0/24 ip4:89.42.223.0/24 ip4:89.42.218.0/24 ip4:89.42.220.0/24 ip4:89.39.83.19/32 -all