Spam blacklist — Buscar Sí
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Spam blacklist

Check an IPv4 address against common DNS-based block lists.

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Related Herramienta Buscar Sís

These checks complement the result above. The current domain/URL is carried forward when the next tool accepts it.
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Email check

Validate email format and look up MX records.

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SPF / DKIM / DMARC

Read SPF, DMARC and common DKIM selector Registros TXT for a domain.

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Búsqueda DNS

Look up A, AAAA, CNAME, MX, NS, TXT, SOA and CAA records with TTL plus basic email-DNS checks.

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IP & domain info

Resolve public IPs, reverse DNS, registry/routing ownership, ASN, name servers and mail routing.

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Seguridad
Buscar Sí accepts only public Internet targets. Local, private and reserved addresses are blocked, redirects are revalidated, standard web ports are enforced and diagnostics use short timeouts.