DNS Lookup
Query common DNS record types and inspect resolved answers instantly.
Advanced — Default resolver · DNSSEC Off
What is DNS Lookup?
The Domain Name System (DNS) is the internet's phone book—it maps domain names like example.com to IP addresses, mail servers, and other infrastructure records. A DNS lookup queries these records so you can verify configuration, troubleshoot email delivery, audit a domain's setup before migration, or debug resolution issues. ToolCrux supports A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, and SRV records.
Real-world use cases include verifying A records after a DNS change, checking MX records for email delivery, inspecting TXT records for SPF/DKIM/domain verification, auditing nameservers before a migration, and debugging why a domain isn't resolving. Developers and sysadmins use it daily; marketers use it to verify domain ownership.
How to Use DNS Lookup
- Enter a domain name (e.g.,
example.com) in the Domain field. - Select a record type: A (IPv4), AAAA (IPv6), MX (mail), TXT, CNAME, NS, SOA, CAA, or SRV.
- Click Lookup or press Ctrl+Enter. Results appear in a structured table with TTL.
- Switch to Raw view for the full JSON response. Use Copy or Save to export.
- Open Advanced to choose a resolver (Cloudflare, Google, or default) or enable DNSSEC details.
Tips & Best Practices
DNS propagation can take minutes to 48 hours. If your change appears here but not in your browser, your local resolver is still serving a cached copy. TTL (Time To Live) indicates how long resolvers cache the record—lower TTL means faster propagation. Use Ctrl+Shift+C to copy and Esc to clear. For domain registration details, try our WHOIS Lookup.
When to Use This Tool
Use DNS Lookup when verifying DNS configuration, troubleshooting email, or auditing domain setup. Pair it with the WHOIS Lookup for registration data, or the What's My IP tool to check your own connection.
Frequently Asked Questions
What is a DNS lookup?
A DNS lookup translates a human-readable domain name (like example.com) into the IP addresses and other records that computers use to route traffic. This tool queries DNS servers and returns the raw record data.
What DNS record types can I query?
This tool supports A (IPv4), AAAA (IPv6), CNAME (alias), MX (mail), TXT (text/verification), NS (name server), SOA (start of authority), CAA (certificate authority authorization), and SRV (service locator) records.
What does TTL mean in DNS results?
TTL (Time To Live) is the number of seconds a DNS resolver should cache the record before re-querying. A lower TTL means changes propagate faster; a higher TTL reduces lookup latency for repeat queries.
Why are my DNS changes not showing up?
DNS propagation can take minutes to 48 hours depending on the record's previous TTL and caching by intermediate resolvers. This tool queries fresh results, so if your change appears here but not in your browser, your local resolver is still serving a cached copy.
Is this tool free to use?
Yes. DNS Lookup on ToolCrux is completely free with no signup, no rate limits for normal use, and no data stored. You can also check your public IP or run a WHOIS lookup from the same suite.