Free Network Tools Online
Troubleshoot and analyze network connections directly from your browser. Every lookup and test runs privately and securely.
IP Lookup
Find location and metadata for any IP address.
DNS Lookup
Query DNS records of any domain using DoH.
WHOIS Lookup
Retrieve registration details for domains.
Internet Speed Test
Test download, upload, and latency speed client-side.
Browser Fingerprint Viewer
View browser headers, canvas, and canvas fingerprints.
SSL Checker
Verify SSL certificates and details of any website.
Ping Test
Check the ping and latency to various public servers.
Network Diagnostics, Domain Intelligence, and Security Analysis From Your Browser
Network troubleshooting and domain research used to require a command line, specialised software, or access to server infrastructure. Today, modern browser APIs and privacy-respecting public services make it possible to perform IP geolocation, DNS resolution, WHOIS lookup, SSL certificate inspection, and latency measurement entirely from a browser tab — no terminal, no installs, no command-line expertise required.
EsyTool's network tools combine browser-accessible APIs with carefully chosen public data sources to deliver accurate, real-time network intelligence. Queries are made directly from your browser wherever possible, and all results are displayed locally without any intermediate storage.
When to Use Each Network Diagnostic Tool
Different network problems call for different tools. Here is a practical guide to which tool solves which problem:
- DNS Lookup: Use when a domain isn't resolving, when verifying DNS propagation after changing nameservers, or when checking MX records to diagnose email delivery failures.
- IP Lookup: Use to identify the country, ISP, and ASN of any IP address — useful for analysing server locations, identifying suspicious traffic sources, or verifying CDN edge node assignments.
- WHOIS Lookup: Use before purchasing a domain (check registration history), to find abuse contact details for a domain sending spam, or to verify domain expiry dates.
- SSL Checker: Use to verify TLS certificate validity, check the certificate chain, confirm the issuing CA, and monitor days-until-expiry before a certificate lapses and causes browser warnings.
- Ping Test: Use to measure HTTP round-trip latency to global servers, helping identify high-latency regions for CDN configuration decisions.
- Internet Speed Test: Use to benchmark your current download and upload speeds and ping — helpful for diagnosing slow connections or verifying ISP-promised speeds.
Overview of Network Tools
DNS Lookup
Query A, AAAA, MX, TXT, CNAME, NS, and SOA records for any domain via DNS over HTTPS (DoH). Bypasses local DNS cache to return authoritative results from Google and Cloudflare resolvers.
IP Lookup
Geolocate any IPv4 or IPv6 address: country, city, ISP, ASN, latitude/longitude, and time zone. Useful for CDN planning, fraud detection research, and server audits.
WHOIS Lookup
Retrieve domain registration data: registrar, registrant organisation, creation date, expiry date, and nameservers. Useful for domain due diligence and abuse reporting.
SSL Certificate Checker
Verify TLS certificate validity, inspect the full chain, check the issuing CA, and see the exact expiry date. Prevent revenue loss from unexpected certificate lapses.
Browser Fingerprint Viewer
See exactly what data your browser exposes to websites: User-Agent string, screen resolution, canvas fingerprint hash, WebGL renderer, installed plugins, and timezone. Read-only — nothing is transmitted.
Internet Speed Test
Measure download speed, upload speed, and ping latency using multi-threaded HTTP transfers. Results represent your current connection to the test server's geographic location.
Best Practices for Network Diagnostics
- Monitor SSL expiry proactively: An expired TLS certificate takes your website offline for all visitors in under a second. Set a calendar reminder 30 days before expiry, or use the SSL Checker to audit all your domains monthly.
- Always check both A and AAAA records: Modern networks route IPv6 traffic on AAAA records. If your server has an IPv6 address but an incorrect AAAA record, IPv6-preferring clients may fail to connect even though IPv4 works.
- Verify DNS propagation from multiple resolvers: DNS changes can take up to 48 hours to propagate. Use the DNS Lookup tool to query both Google (8.8.8.8) and Cloudflare (1.1.1.1) resolvers to check propagation status across major providers.
Frequently Asked Questions
What is DNS over HTTPS (DoH) and why does EsyTool use it?
DNS over HTTPS encrypts DNS queries inside standard HTTPS traffic, preventing your ISP or network observer from seeing which domains you are looking up. EsyTool's DNS Lookup uses DoH endpoints from Google and Cloudflare to provide accurate, privacy-respecting DNS resolution directly in the browser.
What does ASN mean in the IP Lookup results?
An Autonomous System Number (ASN) is a unique identifier assigned to a network operator — such as an ISP, CDN, cloud provider, or large enterprise. Knowing an IP's ASN helps identify whether traffic originates from a data centre (potential bot), a residential ISP, or a known CDN edge node.
Why does my speed test result differ from my ISP's advertised speed?
Speed test results are affected by the distance to the test server, network congestion, your router's Wi-Fi performance, and the number of simultaneous devices on your connection. Run the test over a wired Ethernet connection and at different times of day for the most representative results.