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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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