It can be anything! An apex, subdomain, or even a URL.
Results forwww.security.live.com.office.rp-microsofto365.federicodemo.myshn.eu
security.live.com.office.rp-microsofto365.federicodemo.myshn.eulive.com.office.rp-microsofto365.federicodemo.myshn.eucom.office.rp-microsofto365.federicodemo.myshn.euoffice.rp-microsofto365.federicodemo.myshn.eurp-microsofto365.federicodemo.myshn.eufedericodemo.myshn.eumyshn.eueu
Registrar
Creation Date
DNSSEC
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