DNS Lookup Tool
Look up DNS records for any domain — A, AAAA, MX, TXT, NS, CNAME, and SOA records.
About DNS Lookup Tool
Perform comprehensive DNS lookups for any domain name. Query A, AAAA, MX, TXT, NS, CNAME, and SOA records. Diagnose DNS issues, verify email configuration, and check domain settings with our free DNS lookup tool.
What Is DNS?
The Domain Name System (DNS) is the internet's address book. It translates human-readable domain names like "example.com" into IP addresses like "93.184.216.34" that computers use to find each other. Without DNS, you would need to memorize numerical IP addresses for every website you visit. DNS is a distributed, hierarchical system with servers around the world working together to resolve billions of queries every day.
How to Use This Tool
Enter any domain name into the input field above and click Lookup. The tool queries DNS servers for the domain's records and displays the results organized by record type. You can look up A records (IPv4 addresses), AAAA records (IPv6 addresses), MX records (mail servers), TXT records (verification and policy data), NS records (authoritative name servers), CNAME records (aliases), and SOA records (zone authority information).
Understanding DNS Record Types
A records map a domain to an IPv4 address, and AAAA records map to IPv6. MX records specify which mail servers handle email for the domain, with priority values indicating preference order. TXT records hold text data used for email authentication (SPF, DKIM, DMARC), domain verification, and other purposes. NS records identify the authoritative name servers for the domain. CNAME records create an alias from one domain name to another. SOA records contain administrative information about the DNS zone.
Why DNS Lookups Matter
DNS lookups are essential for diagnosing website and email issues. If a website is not loading, a DNS lookup can reveal whether the domain points to the correct IP address. If emails are not being delivered, checking MX records can identify misconfigured mail servers. TXT record lookups help verify that SPF, DKIM, and DMARC email authentication is properly configured. Network administrators, web developers, and IT professionals regularly use DNS lookups as a first step in troubleshooting.
How DNS Resolution Works
When you type a domain into your browser, your device first checks its local cache. If the answer is not cached, the query goes to your ISP's recursive resolver, which checks its own cache. If still unresolved, the resolver queries the root name servers, then the top-level domain (TLD) servers (like .com or .org), and finally the authoritative name servers for the specific domain. This entire process typically completes in milliseconds. DNS responses are cached at each level with a time-to-live (TTL) value that controls how long the record stays valid.
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