Toolbox

Pick a tool. Peek behind the curtain.

All free, no login. Most run entirely in your browser.

VPN · WebRTC · IPv6 · DNS

One click, four checks. Find out if your VPN is actually doing its job.

Is this IP masked?

Check whether any IP belongs to a VPN, proxy, Tor exit or datacenter.

50+ DNSBLs, live

See if an IP is on spam or abuse blocklists, with delisting links.

Passwords & emails

Has your password or email leaked? Uses k-anonymity, so your password is never sent.

What trackers collect

See the device fingerprint any site can build without a single cookie.

Generate + strength test

Strong passwords and passphrases, generated 100% on your device.

A · AAAA · MX · TXT · NS

Records, reverse DNS and hostname → IP in one place.

What your browser sends

Every header your browser sent us, explained in plain language.

Hop map + spoof check

Paste raw headers to map the route and flag SPF, DKIM and DMARC failures.

2-minute quiz

A friendly quiz that becomes your personal privacy to-do list. Nothing leaves your device.

CIDR · masks · hosts

Network, broadcast, mask and host range for any IPv4 or IPv6 prefix, with splitting into subnets.

Which tool answers which question#

Is my VPN doing its job?: Run the leak test for IP, WebRTC, IPv6 and DNS leaks, and the VPN, proxy and Tor check to see how a site would classify your address.
What does my connection give away?: The HTTP header viewer shows what your browser sends, and the fingerprint viewer shows what it lets a site work out. Your address is on the home page.
Why is my email rejected or going to spam?: Check the sending address with the blocklist check, read its SPF and reverse records with the DNS lookup, and trace a message with the email header tracer.
Have my details leaked?: Use the breach check, replace what it finds with the password generator, and see what else to fix with the privacy quiz.
I am planning or debugging a network.: Work out ranges with the subnet calculator, look up names with the DNS lookup, and identify an address with the IP lookup.
Who owns this address?: Any IP address, domain or URL lookup shows the network, the holder, and the abuse contact the registry publishes.

Tools that work on your own data run entirely in your browser: the leak test, the fingerprint viewer, the password generator, the email header tracer, the subnet calculator and the privacy quiz. The DNS lookup, the HTTP header viewer, the blocklist check and the VPN, proxy and Tor check need our server to make the query, and do not store it. The breach check sends only what its page describes, and never a password.

Each tool has a section under it that says how to read its answer. For the concepts behind them, start with the guides: what an IP address is, how websites see it, and how DNS works.