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Búsqueda de DNS gratuita para su dominio

Genere un informe de DNS para su dominio. Regístrese para obtener una cuenta gratis de Site24x7 para supervisar hasta 5 sitios web de forma gratuita y continuada y recibir una alerta cuando deje de estar activa.

¿Qué es DNS?

DNS son las iniciales en inglés para Sistema de nombres de dominio. Comúnmente conocido como directorio telefónico de Internet, el DNS traduce los nombres de dominio a direcciones IP para que los navegadores puedan recuperar la información necesaria.

Por ejemplo, cada máquina en Internet, ya sean equipo portátiles o servidores web, tiene una dirección IP única. Entonces, al escribir un nombre de dominio, por ejemplo,www.zylker.com, su dirección IP correspondiente se asigna con la ayuda de DNS y la página web se carga debidamente.

¿Cuáles son los registros para buscar en un informe de DNS?

Los registros DNS son archivos de texto que contienen información holística sobre el nombre de dominio en particular, incluida su dirección IP, nombres de alias, etc. A continuación algunos de los registros DNS más comunes:

  • Un registro: Muestra la dirección IPV4 del dominio.
  • Registro AAAA: Muestra la dirección IPV6 del host.
  • CName: Muestra si la dirección dada es un alias o subdominio de un dominio. Todos los registros de CName apuntan a un dominio y no a una dirección IP.
  • Registro MX: Muestra el servidor de correo electrónico SMTP del dominio correspondiente.
  • Registro TXT: Muestra datos legibles por máquina, como detalles de encriptación, marco de directivas del remitente, DKIM, DMARC, etc.
  • Registro NS: enumera los nombres y detalles del servidor de nombres autorizados del dominio correspondiente
  • SOA Record: Contains administrative information about the DNS zone, including the primary name server, hostmaster email, serial number, and timing values for refresh, retry, and expiry.
  • PTR Record: Used for reverse DNS lookups, mapping an IP address back to a domain name. PTR records are essential for email server validation.

How to Perform a DNS Lookup

Follow these steps to run a DNS lookup using this free tool:

  1. Enter the domain name (e.g., example.com) in the input field above.
  2. Click Analyze to start the DNS lookup.
  3. Review the results, which include MX records, SOA records, reverse DNS lookup, name server performance, and DNS traversal data.
  4. Use the tabbed results to run additional checks such as website availability, ping tests, IP lookups, and geolocation.

Understanding Your DNS Lookup Results

When you run a DNS lookup with this tool, the report is organized into the following sections:

  • MX Records: Shows the mail exchange servers for the domain, their IP addresses, TTL values, and priority. Lower priority numbers indicate preferred mail servers.
  • SOA Record: Displays zone authority details including the primary server, hostmaster contact, serial number, and timing intervals for refresh, retry, and expiry.
  • Reverse DNS Lookup: Checks whether the domain's IP addresses have valid PTR records, which is important for email deliverability and server trust.
  • Name Server Performance: Tests each authoritative name server for the domain, showing resolved IPs, TTL values, response times, and availability status.
  • DNS Traversal: Traces the full DNS resolution path from root servers through TLD servers to authoritative name servers, showing response times at each hop.
  • Namespace Server Delegation: Verifies that the parent zone correctly delegates to the domain's name servers and checks for consistent glue records.

Beneficios de usar la herramienta de DNS de Site24x7:

La herramienta de búsqueda de DNS de Site24x7 enumera los registros DNS relevantes de los nombres de dominio especificados. Resulta útil porque cualquier cambio en los registros DNS se captura al instante. También puede usar la supervisión de DNS de Site24x7 para supervisar su infraestructura de DNS distribuido.

  • Comprehensive report: Retrieve MX, SOA, NS, reverse DNS, name server performance, and DNS traversal results in a single lookup.
  • Instant results: Get your DNS records displayed immediately with no signup required.
  • Troubleshooting: Identify misconfigured records, missing mail servers, or delegation issues quickly.
  • Free and unlimited: Run as many DNS lookups as you need at no cost.

FAQs

What is the difference between a DNS lookup and DNS propagation?
A DNS lookup queries the current DNS records for a domain from authoritative name servers. DNS propagation refers to the time it takes for updated DNS records to spread across all DNS servers worldwide, which can take up to 48 hours. Use a DNS propagation checker to track whether your changes have reached servers in different regions.
Why is my DNS lookup returning different results than expected?
Unexpected DNS results can occur for several reasons: your DNS changes may still be propagating, your local DNS resolver may have cached old records, or there could be a misconfiguration in your zone file. Check the TTL values in your lookup results to see how long records are cached, and compare results from multiple DNS servers.
How do DNS lookups affect website performance?
Every first visit to a website requires a DNS lookup to resolve the domain to an IP address. Slow DNS resolution adds latency before the browser can even start loading the page. The Name Server Performance section in this tool shows how quickly each authoritative server responds. Keeping TTL values reasonable and using a reliable DNS provider helps reduce lookup times.
How often should I check my DNS records?
Run a DNS lookup after every DNS change to confirm the update is live. For ongoing monitoring, set up automated DNS monitoring to get alerted whenever records change unexpectedly, name servers go down, or resolution times spike.
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