Free online tools

Instantly view your public IP with city, country, timezone, ISP, and VPN/proxy flags. Check another IPv4 or IPv6 address in one click.

Enter a URL and User-Agent to see each hop in the redirect chain with HTTP status codes — like curl --head, without HTML output.

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

Locate your SPF record and get warnings about common misconfigurations.

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 /robots.txt from a URL to inspect crawl rules without opening curl.

Spot bot-specific redirects by comparing chains for Chrome vs Googlebot, and more.

Syntax, MX, and deliverability signals for a single address — powered by our API.

Carrier, line type, and validity for international numbers.

Check IBAN structure and bank metadata in seconds.

Verify EU VAT numbers and see registration details when available.

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

Paste JSON, format with indentation, or minify for production payloads.

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 timestamps (sec/ms/µs/ns), pick a UTC date/time, and copy RFC/ISO formats.

CIDR breakdown, split subnets, convert masks, and verify if an IP belongs to a network.

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