DNS Lookup
Interroga i record DNS di qualsiasi dominio: A, AAAA, MX, NS, TXT, CNAME, SOA. Supporta anche il Reverse DNS Lookup per trovare l'hostname di un IP.
Ricerca DNS
Come utilizzare DNS Lookup
Choose a method
Select "DNS Lookup" to query domain records or "Reverse DNS" to find the hostname associated with an IP address.
Insert domain or IP
Enter domain name (e.g. example.com) or IP address in the text field. Select the types of records you want to query by checking the checkboxes.
Start search
Search for and send the query to the DNS server. The results show all found records with values and TTL for each selected type.
Analyze Records
Verify MX records for mail, TXT for SPF/DKIM/DMARC, A/AAAA for IP addresses and NS for authoritative domain name servers.
Suggerimenti
- Use TXT type to verify your domain's SPF, DKIM, and DMARC settings.
- If a record CNAME is present, other types (except MX and NS) cannot coexist on the same name according to RFC rules.
- Check the MX record for email debugging and ensure the reverse DNS (PTR) of your mail server's IP address matches the configured hostname.
Domande frequenti
What are DNS records and what do they serve for?
DNS records map domain names to network resources. A records point to IPv4, AAAA to IPv6, MX manage mail, NS identify authoritative nameservers, TXT contain text data (SPF, DKIM), CNAME create aliases, SOA indicates the primary nameserver.
What is TTL and how does it affect DNS propagation?
Time To Live (TTL) indicates for how many seconds DNS resolvers can cache a record. A low TTL (300-600s) allows for quick updates, while a high TTL (86400s) reduces server load. After a DNS update, global propagation takes anywhere from a few minutes to 48 hours depending on the previous TTL.
How does Reverse DNS lookup work?
Reverse DNS Lookup converts an IP address to its hostname through a PTR record. The IP is inverted and queried in the in-addr.arpa (IPv4) or ip6.arpa (IPv6) domain. It's used to verify mail server legitimacy and for security audits.
How do I check if my SPF is correctly configured?
Perform a TXT lookup on your domain: you should find a record starting with "v=spf1". Verify that it contains all the IPs and mail providers sending emails on your behalf. If missing or empty, emails may end up in spam.
Why do DNS records take time to propagate?
Be concise — keep similar length. Translation: DNS resolvers in the world store records in cache for the duration of the TTL. If your old TTL was 86400 seconds (24 hours), resolvers can continue to serve the old value for a full day. Lower the TTL to 300 seconds before planned changes to reduce propagation time.