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

Results for_u.romans.co.uk._spf.smart.ondmarc.com

Resolver

Location

TXT

Name	TTL	Value
_u.romans.co.uk._spf.smart.ondmarc.com	3600	v=spf1 ip4:40.92.0.0/15 ip4:52.100.0.0/15 ip4:40.107.0.0/16 ip4:52.102.0.0/16 ip4:52.103.0.0/17 ip4:54.240.0.0/17 ip4:104.47.0.0/17 ip4:24.110.64.0/18 ip4:23.251.224.0/19 ip4:76.223.128.0/19 ip4:216.139.64.0/19 ip4:216.221.160.0/19 ip4:23.249.208.0/20 i p4:69.169.224.0/20 ip4:76.223.176.0/20 ip4:108.179.144.0/20 ip4:143.244.80.0/20 include:_p.1.1365oo2._u.romans.co.uk._spf.smart.ondmarc.com ~all