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Domain footprint: castlegatebooks.com
Resolved live just now — where this domain's services actually run, with each address attributed by OrgIndex. A DNS observation, not registry data: many organisations run entirely on providers' networks and hold no IP space of their own.
Mail:
fallbackmx.spamexperts.eu → N-able Acquisition Company B.V. ·
lastmx.spamexperts.net → Cogent Communications, LLC ·
mx.spamexperts.com → N-able Acquisition Company B.V.
SPF sends via:
antispamcloud.com · spf.guru.net.uk
No organisation is registered under the name "castlegatebooks.com"
The addresses above are where it actually runs — resolved live and attributed to the operator that registered each range. That is the answer for a domain; a name match here would only add something if a company were registered under this name too.
Sites hosted on a provider (OVH, Cloudflare, AWS and the like) show that provider, because the address space is registered to them rather than to the site's owner.