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

Results forspf.slweb.ru

Resolver

Location

TXT

Name	TTL	Value
spf.slweb.ru	3600	v=spf1 ip4:194.226.133.0/24 ip4:77.223.110.96/27 ip4:51.250.61.40 ip4:84.201.190.232 ip4:31.192.105.34 ip4:31.192.105.40 ip4:3.74.186.72 ip4:3.74.111.120 ip4:178.154.239.126 ip4:51.250.56.79 -all