Free online tools

Geolocation for your IP or any public address — city, country, timezone, ISP, VPN/proxy flags.

Enter a URL and User-Agent to trace the redirect chain with HTTP status codes — a visual alternative to curl --head.

Resolve common DNS record types in one request — useful for mail setup and troubleshooting.

Find the SPF record and get tips on typical configuration mistakes.

Check _dmarc and selector._domainkey TXT records before changing mail authentication.

Quick peek at the certificate served on HTTPS — expiry, issuer, and fingerprint.

See which security headers a site returns and get a simple hardening score.

Fetch a site's robots.txt by URL in the browser — no terminal needed.

Compare redirect chains for Chrome vs Googlebot to spot crawler-specific differences.

Syntax, MX records, and deliverability for a single address.

Carrier, line type, and international number validity.

IBAN format check and issuing bank details.

Verify EU VAT numbers and see registration details when available.

Convert between currencies or view a full rates table with a selectable base.

Format with indentation or minify for production.

Decode and verify JWTs, inspect claims, or build new HMAC-signed tokens locally.

Quick heuristic parse of any User-Agent, including your current browser.

Translate ünicode domains to punycode for DNS and debugging IDN issues.

Convert Unix time and ISO strings for logs and API responses.

Network address, broadcast, and mask for a CIDR range like 192.168.1.0/24.

Look up what 301, 403, 429, and other codes mean while debugging.

Receive HTTP at your URL and inspect in the browser — webhook debugging on bin.cleariflow.com.