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Consulta de DNS Inverso (PTR)

Encuentra el nombre de host asociado a cualquier dirección IP mediante registros PTR.

Cómo usar esta herramienta

  1. 1

    Type or paste an IP address into the input box, for example 8.8.8.8 or an IPv6 address like 2001:4860:4860::8888.

  2. 2

    Click Lookup to send the address to our server, which runs a reverse DNS (PTR) query against the public DNS system.

  3. 3

    Read the returned hostnames in the results list, or the 'No PTR record found' notice if the address has no PTR record or the lookup fails.

  4. 4

    Try another address to compare results, for example a mail server IP versus a residential or cloud IP.

¿Qué es la Consulta de DNS Inverso (PTR)?

El DNS directo asigna nombres de host a IP (example.com → 1.2.3.4). El DNS inverso hace lo contrario: pregunta '¿qué nombre de host posee esta IP?' mediante registros PTR. Es crucial para la entregabilidad del correo: los servidores de correo sin registros PTR suelen ser rechazados por los grandes proveedores (Gmail, Microsoft) como presuntas fuentes de spam.

Casos de uso comunes

  • Confirm a sending mail server's IP has a valid PTR record before going live, since Gmail and Microsoft 365 often reject or junk mail from IPs with no reverse DNS.

  • Read web server or firewall access logs and turn raw IP addresses into hostnames to spot which networks or providers are connecting.

  • Verify that a cloud or VPS provider correctly applied the custom PTR record you requested for an outbound IP.

  • Investigate a suspicious IP during incident response to see whether it points back to a known ISP, hosting company, or CDN.

  • Sanity-check a newly delegated IP block by confirming PTR records resolve as expected after a network migration.

  • Troubleshoot SSH or service connections where the daemon does a reverse lookup on the client IP and a missing PTR causes slow or failed logins.

Preguntas frecuentes

¿Por qué Gmail requiere registros PTR?
Los registros PTR demuestran que el propietario de la IP controla la zona de DNS inverso, una señal de que el remitente es un operador legítimo y no una red de bots.

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