Error: Too many requests. Please try again later. x
Log In

Ricerca DNS gratuita per il tuo dominio

Genera un report DNS per il tuo dominio. Registra un account Gratuito Site24x7 per monitorare fino a 5 siti Web gratuitamente in modo continuo ed essere avvisato quando diventa inattivo!

Che cos’è il DNS?

DNS è l’acronimo di Domain Name System, il sistema dei nomi del dominio. Una specie di rubrica telefonica di internet, il DNS traduce i nomi dei domini in indirizzi IP in modo che i browser possano ricevere le informazioni necessarie.

Per esempio, ogni apparecchio collegato a internet, dai portatili ai tuoi web server, hanno un indirizzo IP unico. Quando inserisci il nome di un dominio, per esempio www.zylker.com, il suo indirizzo IP viene mappato grazie all’aiuto del DNS e la pagina viene caricata correttamente.

Quali sono i record da osservare in un report DNS?

I record DNS solo file di testo che contengono informazioni olistiche su un determinato nome di dominio, includendo indirizzo IP, nomi di alias, ecc. I seguenti sono alcuni dei più comuni record DNS:

  • Record A: Indica l’indirizzo IPV4 del dominio.
  • Record AAAA: Indica l’indirizzo IPV6 dell’host.
  • CName: Indica se l’indirizzo indicato è un alias o un sottodominio di un dominio. Tutti i record CName puntano a un dominio, non a un indirizzo IP.
  • Record MX: Indica il server SMTP di posta del rispettivo dominio.
  • Record TXT: Indica i dati leggibili della macchina, tra cui dettagli di crittografia, sender policy framework, DKIM, DMARC, ecc.
  • Record NS: Indica i nomi e i dettagli del server dei nomi autorevole del rispettivo dominio
  • 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.

Vantaggi dell’utilizzo dello strumento DNS di Site24x7:

Lo strumento di ricerca DNS di Site24x7 include i record DNS rilevanti per i nomi di dominio inseriti. Questo servizio è pratico perché eventuali modifiche ai record DNS vengono identificate istantaneamente. Puoi utilizzare anche il sistema di monitoraggio del DNS di Site24x7 per tenere sotto controllo la tua infrastruttura DNS distribuita.

  • 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.
]