Pick a tool
Every tool below shows live data from real sources — internet registries, DNS queries, breach databases, or your own browser — and says so plainly when something cannot be checked, instead of guessing.
Security & investigation tools
Email header analyzer
Paste raw email headers to trace the server path, extract the sender's IP, and read SPF, DKIM, and DMARC results. Runs in your browser.
Open toolMAC address lookup
Find the manufacturer behind a MAC address using the live IEEE registry. Identify unknown devices on your WiFi.
Open toolIP blacklist check
Test an IPv4 address against Spamhaus, SpamCop, SORBS, and other DNS blocklists with live DNS queries.
Open toolQR code decoder
Read the link inside a QR code image without visiting it. Decoding runs offline in your browser.
Open toolWhois lookup
Domain registration date, registrar, expiry, nameservers, and IP ownership, live from the registries via RDAP.
Open toolPassword checker
Password strength estimate plus a breach check against Have I Been Pwned. The password never leaves the browser.
Open toolLink expander
Follow every redirect of a short or suspicious URL server-side and see the real destination without visiting it.
Open toolIP & network tools
My public IP
See the public IP address your connection presents right now, with approximate location and ISP. Instant, free, no signup.
Open toolIPv6 test
Test whether your connection supports IPv6, see your IPv4 and IPv6 addresses side by side, and check which one your network prefers.
Open toolASN / ISP lookup
Look up the ASN, ISP, and organization behind any IP address. See which network operator announces the address and where it is registered.
Open toolIP location map
Enter an IP address and see its approximate location pinned on an OpenStreetMap view, with city, region, country, and coordinates.
Open toolBrowser info
See the user agent, platform, vendor, and capability signals your browser exposes to every website you visit. Read locally, nothing uploaded.
Open toolTimezone & language
See the timezone, language list, and locale your browser reports to websites. Useful for spotting VPN and timezone mismatches.
Open toolScreen & device info
Check your screen resolution, viewport size, pixel ratio, color depth, touch support, CPU cores, and device memory as websites see them.
Open toolWebRTC leak test
Test whether WebRTC exposes your real IP address even behind a VPN. See the ICE candidates your browser hands to websites.
Open toolHTTP headers
See the client-visible request signals your browser exposes: user agent, accepted languages, and client hints support.
Open toolDNS lookup
Free DNS lookup for any domain. Resolve A, AAAA, MX, TXT, NS, CNAME, and SOA records live over DNS-over-HTTPS.
Open toolReverse DNS lookup
Free reverse DNS (PTR) lookup. Enter an IPv4 address and find the hostname its owner registered for it, live over DNS.
Open toolSubnet calculator
Free IPv4 subnet calculator. Enter CIDR notation and get the network address, broadcast, netmask, first and last host, and usable host count.
Open toolIPv6 subnet calculator
Free IPv6 CIDR calculator. Enter a prefix like 2001:db8::/32 and get the network address, last address, expanded form, and address count.
Open toolIP validator
Check whether a value is a valid IPv4 or IPv6 address and which family it belongs to. Instant validation in your browser.
Open toolLatency test
Measure your connection's round-trip latency to Cloudflare, Google, and ipify from the browser. Median of warmed samples, honestly labeled.
Open toolSpeed test
Quick browser download speed estimate using a 10 MB sample from Cloudflare, timed from first byte. Honest about being a single-stream check.
Open toolPrivacy check
A quick report of what your current browser session exposes: public IP, WebRTC candidates, HTTPS status, timezone, language, and cookies.
Open toolIP health score
A 0–100 score for your current connection built from local signals: public IP visibility, WebRTC exposure, HTTPS, IPv6, and cookie status.
Open toolThe IP and network tools also live in the homepage tool drawer for quick access, and IP lookup geolocates any address. The full catalog is on the services page.