It can be anything! An apex, subdomain, or even a URL.
Results forco.uk._spf.smart.ondmarc.com
www.co.uk._spf.smart.ondmarc.comuk._spf.smart.ondmarc.com_spf.smart.ondmarc.comsmart.ondmarc.comondmarc.comcom
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It can be anything! An apex, subdomain, or even a URL.