Network Tools
13 free online tools
About Network Tools
When something is not connecting, the questions are basic but the answers are hard to get at — is the site up, where does this domain resolve, is the certificate valid, where does this link really go? ToolForge's network tools answer them from your browser: look up IP geolocation, query DNS records, check SSL certificates and WHOIS data, inspect HTTP headers, trace redirects, test ports, and check whether a site is responding.
Developers, sysadmins, and curious users use them to diagnose problems and investigate domains without installing command-line utilities. Because a browser cannot do everything a native tool can, some of these rely on external services — DNS queries, SSL analysis, WHOIS, and header inspection call out to specialized APIs — and each tool's page is upfront about what it sends where. Others, like the redirect tracer, work directly from your browser.
Popular Network Tools
Related Categories
Internet Speed Test
Check download & upload speed, latency, and jitter
IP Address Lookup
Get location, ISP, and timezone info for any IP
DNS Lookup
Query DNS records for any domain
HTTP Headers Checker
View and analyze HTTP response headers
SSL Certificate Checker
Verify SSL/TLS certificates and security ratings
Ping Tool
Test network latency and connectivity
Port Checker
Check if ports are open or closed on servers
WHOIS Lookup
Get domain registration and owner information
Website Status Checker
Monitor website uptime and availability
URL Redirect Tracer
Follow and analyze HTTP redirect chains
What Is My IP
See your public IPv4 or IPv6 address instantly
User Agent Parser
Decode any browser User Agent string into browser, OS, device
Browser & Screen Info
Check screen resolution, viewport, pixel ratio and browser details
Frequently Asked Questions
Do these network tools send my queries to external services?
Some do, by necessity. DNS lookups, SSL certificate analysis, WHOIS, and header inspection rely on specialized external APIs, because a browser cannot perform those directly — each tool's page states which service it uses. Tools like the redirect tracer run directly from your browser.
Why can't a browser do a real ping or port scan?
Browsers cannot open raw network sockets for security reasons, so true ICMP ping and low-level TCP port scanning are not possible from a web page. These tools approximate the checks using HTTP requests, which is reliable for web-facing services but differs from native command-line tools.
Why might a site show as down here but work in my browser?
Many servers block the kind of background request these tools make, even while serving pages normally to a browser tab. A single "down" or failed result can reflect that restriction rather than a real outage, so confirm by opening the site directly.
