Free IP, DNS & network tools

Every tool you need to check an IP address, debug DNS, investigate a domain, secure email and test your connection. Free, fast and no sign-up.

IP Address tools

What Is My IP Instantly see your public IP address, ISP, ASN, city, country and time zone on a map. Free, fast and private IP checker with no sign-up.
IP Lookup Free IP lookup tool: find the country, city, ISP, ASN, organization and time zone of any IPv4 or IPv6 address, shown on an interactive map.
IP Address Type Checker Check whether an IP address is public, private, loopback, CGNAT, multicast, documentation or reserved, and validate its IPv4 or IPv6 format.
IP Blacklist Check Check if an IP address is blacklisted on popular DNS blocklists like SpamCop, Barracuda, UCEPROTECT and PSBL, with delisting links.
ASN Lookup ASN lookup: find the autonomous system for an IP or AS number, its owner, country, announced IPv4/IPv6 prefixes and routing status.
Reverse DNS Lookup Reverse DNS lookup tool: find the PTR record and hostname for any IPv4 or IPv6 address, then verify it with a forward-confirmed lookup.
What Is My ISP What is my ISP? See which internet service provider you are connected through, your ASN, connection type and the IP range your ISP assigned.
Share My Location Share your current location in one tap: get a Google Maps, Apple Maps or Waze link, send it by WhatsApp, Telegram, SMS or email, or show a QR code. Private and free.
What Is My Location What is my location? See where your IP address places you and compare it with your device's precise browser location on a map.

Connection Tests tools

Internet Speed Test Free internet speed test: measure your download and upload speed in Mbps, plus ping and jitter, in seconds. No app needed. Find out if you get the speed you pay for.
IPv6 Test Test your IPv6 connectivity in seconds. See your IPv4 and IPv6 addresses side by side and find out whether your ISP and browser are IPv6 ready.
WebRTC Leak Test WebRTC leak test: check whether your browser reveals your real or local IP address through WebRTC, even when you are using a VPN.
Ping & Jitter Test Free online ping test: measure your connection's latency, jitter and packet loss from your browser, and learn what good ping is for gaming and calls.
Open Port Checker Open port checker: test whether a TCP port on your public IP address is reachable from the internet. Useful for port forwarding and servers.
What Is My User Agent See your browser user agent string, browser and operating system, screen size, language, time zone and which privacy features are enabled.
Internet Troubleshooter Internet not working? Follow our step-by-step troubleshooter for no connection, slow speeds, Wi-Fi drops, DNS errors and websites that will not load.

DNS & Email tools

DNS Lookup Free online DNS lookup: query A, AAAA, CNAME, MX, NS, TXT, SOA, CAA and SRV records for any domain using fast DNS-over-HTTPS resolvers.
DNS Propagation Checker Check DNS propagation across Cloudflare, Google, AdGuard, NextDNS, AliDNS and DNS.SB resolvers to see whether your DNS change has gone live.
DNSSEC Checker DNSSEC checker: test whether a domain is signed, whether its DS and DNSKEY records match, and whether validating resolvers accept its answers.
MX Lookup MX lookup tool: list the mail exchanger records for any domain with priorities, resolved IP addresses and the email provider behind them.
Phishing Email Analyzer Paste a suspicious email's headers or text to check sender authentication, spoofed senders, deceptive links and other phishing warning signs. Free and private.
Email Header Analyzer Paste email headers to trace every server hop and delay, check SPF, DKIM and DMARC results, and spot spoofing. Runs privately in your browser.
SPF & DMARC Checker Check a domain's SPF and DMARC records, spot common mistakes like multiple SPF records or a missing policy, and learn how to fix them.

Domain & Website tools

Website Security Scanner Free website security scanner: check HTTPS, TLS versions, certificate, security headers, cookies, mixed content, DNSSEC and email security, then download a graded report.
SEO Checker Free SEO checker: audit any page's title, meta description, headings, canonical, indexability, robots.txt, sitemap, structured data and mobile readiness.
Website Speed Test Website speed test: measure DNS, connection, TLS and server response time, page weight, compression and render-blocking resources, with prioritised fixes.
AI Search (GEO) Checker Free GEO checker: test whether ChatGPT, Perplexity, Claude and Google AI Overviews can crawl, understand and cite your page, with fixes for robots.txt, llms.txt, schema and content.
Website Location & Hosting Checker Find where any website is hosted: server IP, country and city on a map, hosting provider or CDN, ASN, DNS provider and email provider.
WHOIS Lookup Free WHOIS lookup for domains and IP addresses. See the registrar, creation and expiry dates, name servers, status and network owner via RDAP.
Domain Availability Checker Check whether a domain name is available to register. Searches registry RDAP data and DNS across popular TLDs like .com, .net, .org and .io.
SSL Certificate Checker SSL checker: inspect any website's TLS certificate, issuer, validity dates, days until expiry, covered hostnames and negotiated TLS version.
HTTP Headers Checker Check the HTTP response headers and full redirect chain of any URL, and grade its security headers like HSTS, CSP and X-Frame-Options.
Redirect Checker Redirect checker: follow a URL's full redirect chain, see every 301, 302, 307 and 308 hop with status codes and timing, and spot loops and chains.
Is It Down? Is it down or just me? Check whether a website is up, see its HTTP status code and response time from our server, and get tips if it is down.

Calculators tools

Subnet Calculator IPv4 and IPv6 subnet calculator: get the network address, broadcast, usable host range, netmask, wildcard mask and host count for any CIDR.
CIDR / IP Range Converter Convert an IP range to the minimal list of CIDR blocks, expand a CIDR into its first and last address, and check whether an IP is inside a range.
IP Address Converter Convert IP addresses between dotted decimal, integer, binary, hexadecimal and IPv4-mapped IPv6 formats. Works for both IPv4 and IPv6.
MAC Address Lookup MAC address lookup: find the vendor or manufacturer of any network device from its MAC address or OUI prefix, using the official IEEE registry.
Formatters, converters & developer utilities

JSON, YAML, SQL and XML formatters, Base64, JWT decoder, hash and UUID generators.

Developer tools
Prefer the command line?

Get your IP with curl whatsmyipnumber.com/ip. No key required.

View the API
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