WHOIS Lookup
Only query what is needed
Network diagnostics use the domain, URL, or IP you enter to run the requested check and show actionable results.
Quick workflow
- Enter a domain, URL, IP address, or DNS value.
- Run the check and review warnings or records.
- Use the suggested follow-up tools to verify related settings.
Useful tip
For DNS changes, check records first, then propagation, and finally related email or SSL settings.
You might also like
Luck predicts what you like
IP Format Converter
IP address format conversion
Nginx Location Explainer
Paste Nginx location blocks and a request path to see which rule wins, including exact, ^~, regex, and prefix matching order.
CSP Header Generator
Generate Content Security Policy headers with common directives, presets, report-only mode, and security warnings.
DKIM Record Formatter
Clean DKIM public keys and format DNS-friendly TXT records with quoted chunks.
HTTP Headers Checker
Inspect HTTP response headers for CORS-enabled URLs.
CORS Config Generator
Generate CORS snippets from allowed origins, methods, headers, credentials, and preflight settings.
Image Watermark
Add text watermarks to images locally with position, color, and opacity controls.
JPG to PNG
Convert JPG photos to PNG in your browser without uploading files.