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Domain footprint: sagemath.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: 104.26.10.200 → Cloudflare, Inc. · 104.26.11.200 → Cloudflare, Inc. · 172.67.75.32 → Cloudflare, Inc. · 2606:4700:20::ac43:4b20 → Cloudflare, Inc. · 2606:4700:20::681a:bc8 → Cloudflare, Inc.

Mail: sagemath.openbsd.amsterdam → NL-HIGH5-OBSDAMS

SPF sends via: sendgrid.net

No organisation is registered under the name "sagemath.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.