How to Perform DNS Lookups Online for Free
DNS (Domain Name System) lookups translate human-readable domain names into IP addresses and retrieve other DNS records like mail servers, nameservers, and verification records. Whether you're troubleshooting website issues, configuring email, or verifying domain ownership, DNS lookups are essential. This guide shows you how to perform DNS lookups using fixie.tools — a free online tool that queries DNS records instantly with no signup required.
Step 1: Visit the DNS Lookup Tool
Go to fixie.tools/dns in your web browser. The tool works on all devices and requires no software installation or account creation. DNS queries are performed directly from the tool to authoritative nameservers, providing real-time, accurate results.
Step 2: Enter a Domain Name
Type the domain name you want to look up in the input field. You can enter a root domain (like example.com), a subdomain (like www.example.com or mail.example.com), or any valid hostname. The tool accepts both fully qualified domain names and partial hostnames. No need to add http:// or https:// — just the domain name itself.
Step 3: Select DNS Record Types
Choose which DNS record types you want to query. A records map domains to IPv4 addresses. AAAA records map to IPv6 addresses. MX records specify mail servers for email routing. TXT records contain text data used for domain verification, SPF, DKIM, and DMARC email authentication. CNAME records create domain aliases. NS records list authoritative nameservers. SOA records contain zone authority information. You can query individual record types or select 'All Records' to retrieve everything at once.
Step 4: View and Interpret Results
After clicking 'Lookup', the tool displays all matching DNS records organized by type. Each record shows its value, TTL (time to live), and priority (for MX records). A records show IP addresses. MX records show mail server hostnames ranked by priority (lower numbers = higher priority). TXT records display text content like SPF policies or verification tokens. NS records list nameservers responsible for the domain. The tool highlights important information and explains common record types to help you interpret results.
Step 5: Troubleshoot DNS Issues
Use the results to diagnose problems. If a domain has no A or AAAA records, it won't resolve to a website. If MX records are missing or incorrect, email won't be delivered. TXT records are essential for email authentication (SPF, DKIM, DMARC) and domain ownership verification. Check that NS records point to the correct nameservers. Compare TTL values to understand how long DNS records are cached. For propagation issues, the tool queries authoritative nameservers directly to show current values even if local caches are outdated.