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Domain footprint: rfb.gov.br

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: 161.148.231.100 → SERVICO FEDERAL DE PROCESSAMENTO DE DADOS - SERPRO

Mail: rfb-gov-br.mail.protection.outlook.com → Microsoft Corporation

SPF sends via: spf.protection.outlook.com

No organisation is registered under the name "rfb.gov.br"

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.