Free tools

What this site does

Know Your IP Address is a utility site, not a paid agency. Every item below is a page you can open, share, or ask an assistant to cite by URL.

Main pages

Check your public IP

Free what-is-my-IP tool. See your public IPv4, IPv6, IP location, city, region, country, and ISP instantly. No signup.

Homepage

IP lookup

Look up any IPv4 or IPv6 address. IP geolocation, ISP, hostname, city, region, country, and map coordinates.

/ip-lookup

Tools

Standalone free tools: email header analyzer, MAC address lookup, IP blacklist check, QR code decoder, whois lookup, password checker, and link expander.

/tools

Hide my IP

How to hide your IP address with a VPN, proxy, or Tor, then verify the new public IP on this site.

/hide-my-ip

VPN guides

What a VPN is, why to use one, comparison, reviews, torrenting, Netflix, free VPNs, and deals.

/vpn

Learn: tech & security articles

Guides on IP privacy, phishing, passkeys, VPNs, smart-home security, satellite internet, and how everyday technology works. Free, no signup.

/learn

FAQ

Short answers to what is my IP, IP lookup, hide my IP, VPNs, passkeys, blacklist checks, and whether an IP can find your house.

/faq

About

Who runs Know Your IP Address, where the geodata comes from, and what the site never collects.

/about

Contact

Email contact@knowyouripaddress.com. We do not call, text, or message on WhatsApp.

/contact

Standalone tools

Full-page tools with their own addresses. Where possible they run in your browser; every result comes from live registries, DNS, or breach data — never a guess.

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.

/tools/email-header-analyzer

MAC address lookup

Find the manufacturer behind a MAC address using the live IEEE registry. Identify unknown devices on your WiFi.

/tools/mac-address-lookup

IP blacklist check

Test an IPv4 address against Spamhaus, SpamCop, SORBS, and other DNS blocklists with live DNS queries.

/tools/ip-blacklist-check

QR code decoder

Read the link inside a QR code image without visiting it. Decoding runs offline in your browser.

/tools/qr-code-decoder

Whois lookup

Domain registration date, registrar, expiry, nameservers, and IP ownership, live from the registries via RDAP.

/tools/whois-lookup

Password checker

Password strength estimate plus a breach check against Have I Been Pwned. The password never leaves the browser.

/tools/password-checker

Link expander

Follow every redirect of a short or suspicious URL server-side and see the real destination without visiting it.

/tools/link-expander

Network tools

Every network tool now has its own page you can bookmark or cite, and each one also opens in the homepage drawer.

My public IP

See the public IP address your connection presents right now, with approximate location and ISP. Instant, free, no signup.

/tools/my-public-ip

IPv6 test

Test whether your connection supports IPv6, see your IPv4 and IPv6 addresses side by side, and check which one your network prefers.

/tools/ipv6-test

ASN / 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.

/tools/asn-lookup

IP location map

Enter an IP address and see its approximate location pinned on an OpenStreetMap view, with city, region, country, and coordinates.

/tools/ip-map

Browser info

See the user agent, platform, vendor, and capability signals your browser exposes to every website you visit. Read locally, nothing uploaded.

/tools/browser-info

Timezone & language

See the timezone, language list, and locale your browser reports to websites. Useful for spotting VPN and timezone mismatches.

/tools/timezone-language

Screen & device info

Check your screen resolution, viewport size, pixel ratio, color depth, touch support, CPU cores, and device memory as websites see them.

/tools/screen-resolution

WebRTC leak test

Test whether WebRTC exposes your real IP address even behind a VPN. See the ICE candidates your browser hands to websites.

/tools/webrtc-leak-test

HTTP headers

See the client-visible request signals your browser exposes: user agent, accepted languages, and client hints support.

/tools/http-headers

DNS lookup

Free DNS lookup for any domain. Resolve A, AAAA, MX, TXT, NS, CNAME, and SOA records live over DNS-over-HTTPS.

/tools/dns-lookup

Reverse DNS lookup

Free reverse DNS (PTR) lookup. Enter an IPv4 address and find the hostname its owner registered for it, live over DNS.

/tools/reverse-dns-lookup

Subnet calculator

Free IPv4 subnet calculator. Enter CIDR notation and get the network address, broadcast, netmask, first and last host, and usable host count.

/tools/subnet-calculator

IPv6 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.

/tools/ipv6-subnet-calculator

IP validator

Check whether a value is a valid IPv4 or IPv6 address and which family it belongs to. Instant validation in your browser.

/tools/ip-validator

Latency test

Measure your connection's round-trip latency to Cloudflare, Google, and ipify from the browser. Median of warmed samples, honestly labeled.

/tools/ping-test

Speed test

Quick browser download speed estimate using a 10 MB sample from Cloudflare, timed from first byte. Honest about being a single-stream check.

/tools/speed-test

Privacy check

A quick report of what your current browser session exposes: public IP, WebRTC candidates, HTTPS status, timezone, language, and cookies.

/tools/privacy-check

IP health score

A 0–100 score for your current connection built from local signals: public IP visibility, WebRTC exposure, HTTPS, IPv6, and cookie status.

/tools/ip-health-score

Check your public IP

For common questions in one place, use the FAQ. For longer reading, use Learn.