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Domain footprint: massgeneral.org
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.
Web:
170.223.88.198 → Mass General Brigham Incorporated ·
170.223.157.69 → Mass General Brigham Incorporated
Mail:
phsmgmx.partners.org → Cisco Systems Ironport Division
No organisation is registered under the name "massgeneral.org"
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.