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WorkToolsHub / DNS Debugger
DNS Resolution Protocol.
Query authoritative DNS records, validate mail security configurations (SPF, DKIM, DMARC), and monitor global propagation status.
Frequently Asked Questions
Common questions about this tool and how it works.
DNS propagation is the time it takes for DNS changes to be updated across the internet's network of distributed servers. It typically takes 24 to 48 hours for global propagation to complete, although modern nameservers often update much faster.
If you recently updated your records, they might still be propagating. Other reasons include caching issues on your local machine or ISP, typos in the record name, or incorrect nameserver configurations at your registrar.
These are email authentication methods. SPF (Sender Policy Framework) specifies who can send email for your domain. DKIM (DomainKeys Identified Mail) cryptographically signs emails. DMARC (Domain-based Message Authentication, Reporting, and Conformance) uses both to provide instructions on how to handle unauthenticated mail.
On Windows, run 'ipconfig /flushdns' in the command prompt. On macOS, run 'sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder' in the terminal. On Linux, it depends on your distribution, but often involves restarting the nscd service.