DNS Lookup Tool
Check DNS records for any domain in seconds
Free Online DNS Lookup Tool - Check Domain DNS Records
DNS Lookup is an essential tool for webmasters, system administrators, and developers. Our free service allows you to quickly check all DNS records of any domain, including A, AAAA, MX, TXT, NS, CNAME, SOA, and other record types. The tool works in real-time and provides current information directly from DNS servers.
Why Check DNS Records?
DNS (Domain Name System) is the "phone book of the internet" that translates domain names into IP addresses. Checking DNS records is necessary in the following situations:
- Website troubleshooting - if a site doesn't load, DNS check helps identify resolution issues
- Email setup - checking MX records is crucial for proper mail server configuration
- Email security - verify SPF, DKIM, and DMARC records (TXT) to protect against spam
- Site migration - confirm DNS records updated after moving to new hosting
- CDN setup - check CNAME records when connecting a Content Delivery Network
DNS Record Types
- A record - links domain name to IPv4 address
- AAAA record - links domain to IPv6 address
- CNAME record - creates an alias for another domain
- MX record - specifies mail servers
- TXT record - text information (SPF, DKIM)
- NS record - authoritative name servers
How to run a DNS Lookup
- Enter a domain — just the name, no protocol (google.com, yandex.ru).
- Start the check — the service queries authoritative DNS servers for every record type in parallel.
- Inspect the results — A and AAAA — IPv4/IPv6 addresses; MX — mail servers; TXT — SPF/DKIM/DMARC/verification; NS — where the zone is hosted.
- Compare to expectation — after a migration the result must match the new provider configuration.
Example use cases
Corporate email setup
After adding SPF/DKIM in the registrar panel, confirm TXT records and check that DMARC policy is live globally.
Site migration
Check where the A record points — until DNS cache worldwide updates, some visitors still reach the old server.
Troubleshooting email delivery
If mail goes to spam, inspect MX (is it the actual server?) and TXT (is SPF valid? is DKIM signed?).
Subdomain discovery
CNAME and NS records hint where subdomains like cdn.site.com live — handy for infrastructure audits.
Common mistakes & fixes
- Empty A record after a change
- DNS propagates from 5 minutes to 48 hours. Check TTL: a short TTL (300s) is near-instant, a long one (86400) takes a day.
- SPF "softfail" at Google/Outlook
- A single TXT like v=spf1 include:_spf.mailhost.com ~all is required. Multiple SPF records on one domain break validation.
- DKIM signature fails
- Check the selector TXT, e.g. default._domainkey.site.com — if missing or malformed, mail is treated as unsigned.
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