Free Network Tools
Everything here runs in your browser, needs no account, and takes under a minute. Pick the one that matches your problem.
Internet Speed Test
Measure download speed, upload speed, ping and jitter, then see what your connection can handle: streaming, calls and gaming.
Bufferbloat & Packet Loss Test
Fast speed but laggy calls and games? See how much your delay rises when the line is busy, with an A+ to F grade.
What Is My IP Address?
See your public IP address, whether it is IPv4 or IPv6, and what your browser shares.
DNS Speed Test
Compare how fast public DNS resolvers such as Cloudflare and Google respond from your connection.
Data Usage Calculator
Estimate how many gigabytes your household uses each month and compare it with your data cap.
SSL Certificate Checker
Check any website's HTTPS certificate: whether it is valid, when it expires, who issued it and which TLS version it uses.
WebRTC Leak Test
Check whether your browser reveals your real IP address around your VPN, with a plain guide to DNS leaks.
Speed vs Plan Checker
Enter your plan, run a test and see what percentage of your speed you really get, with a ready-made message for your provider.
Connection Stability Test
Watch your connection for up to two minutes and see lag spikes, lost requests and drops on a live graph.
Ping to Popular Services
See your delay to Google, Cloudflare, Microsoft, Apple and AWS regions worldwide, a guide to game and server regions.
Download Time Calculator
Enter a file size and your speed to see how long a game, movie or backup takes to download.
VPN Speed Test
Test your speed without and with your VPN and see exactly how much it costs you, and whether it was really connected.
IPv6 Test
Check whether your connection has IPv6 as well as IPv4 and see both of your public addresses.
Browser and Device Info
See your browser and version, operating system, screen size, pixel ratio and language, and copy it for support.
DNS Lookup
Look up the A, AAAA, MX, NS, TXT, CNAME and CAA records of any domain.
SPF, DKIM and DMARC Checker
Check your domain email records with plain-English results that show what is missing and how to fix it.
Open Port Checker
Check whether a port such as 25565 or 32400 is open on your own connection, for port forwarding and game servers.
Is It Down? Website Checker
Find out whether a website is down for everyone or only for you, with status, response time and redirects.
Security Headers Checker
Grade a website from A+ to F on HSTS, CSP, clickjacking and cookies.
Redirect Checker
Trace every redirect hop of a URL with status codes, timings and problems such as loops and HTTP downgrades.
Website Response Time (TTFB) Test
Measure how fast a website starts answering and see whether DNS, connection, TLS or the server is slow.
SEO Meta Tag Checker
Score the title, description, canonical, H1, Open Graph and structured data of any page, with a fix for each problem.
Robots.txt and Sitemap Checker
Read the robots.txt and sitemap.xml of any site, find rules that block search engines and test a URL against them.
Which tool should I use?
- Pages load slowly or downloads crawl: run the speed test.
- Calls freeze or games lag, even though speed is fine: run the bufferbloat test.
- You want to know your address, or confirm a VPN changed it: use What is my IP address.
- You use a VPN and want to be sure it's not leaking: run the WebRTC leak test.
- Websites feel slow to start loading: compare resolvers with the DNS speed test.
- You run a website and want to check its certificate or expiry date: use the SSL certificate checker.
- You have a monthly data cap: estimate your usage with the data usage calculator.
- You suspect you are not getting the speed you pay for: use the speed vs plan checker.
- Your connection keeps dropping or freezing: run the connection stability test.
- You want to know which game or server region suits you: try the service latency test.
- You want to know how long a download will take: use the download time calculator.
- You use a VPN and want to know how much it slows you down: run the VPN speed test.
- You wonder whether your connection supports IPv6: run the IPv6 test.
- Support asks which browser or device you use: open browser and device info.
- You need to see where a domain points: use the DNS lookup.
- Your email goes to spam: review your records with the SPF, DKIM and DMARC checker.
- You set up a game server or port forward: check it with the open port checker.
- A website will not open: find out if it is down with the website status checker.
- You want to know how well your website is protected: grade them with the security headers checker.
- A link goes to the wrong place or loops: trace it with the redirect checker.
- Your website feels slow to start: see where the delay is with the response time test.
- You want to improve how a page appears in Google and when shared: run the SEO meta tag checker.
- Your pages are not being indexed: read your files with the robots.txt and sitemap checker.
New to these terms? Our guides explain ping, jitter, Mbps and how to fix a slow connection.