DNS Lookup
Query DNS records for any domain. Supports A, AAAA, MX, CNAME, TXT, and NS.
What Is a DNS Lookup?
A DNS lookup queries the DNS infrastructure to retrieve records associated with a domain. DNS translates human-readable domain names into IP addresses that servers use to route traffic.
Record Types
Common Use Cases
- Verifying DNS propagation — check whether recent DNS changes (A, CNAME, MX records) have propagated after updating your domain.
- Email deliverability troubleshooting — confirm MX and TXT (SPF/DKIM) records are correctly configured before diagnosing why mail is bouncing.
- Migration checks — confirm a domain now points to a new host or IP after a server migration.
- Security audits — spot unexpected or stale DNS records that could indicate misconfiguration or compromise.
Example
Looking up github.com returns its A records pointing to GitHub's load-balanced IPs, along with MX records for its mail routing and TXT records used for domain verification and SPF.
Frequently Asked Questions
Why do I see different results than my own computer?
DNS results can vary based on caching and which DNS resolver is being queried. This tool queries authoritative or public resolvers directly, which may differ from your local ISP's cached results.
How long does DNS propagation take?
Typically a few minutes to 48 hours, depending on the TTL (time-to-live) set on the record and how widely it has been cached across resolvers.
What's the difference between A and CNAME records?
An A record points a domain directly to an IPv4 address. A CNAME record points a domain to another domain name instead of an IP.
Why is my MX record important?
MX records tell other mail servers where to deliver email for your domain. Missing or incorrect MX records cause email delivery failures.