Free Online Network Diagnostic Tools
Six browser-based tools for network troubleshooting, security auditing, and performance testing.
Visual Traceroute
Map the route packets take across the internet with hop-by-hop latency and geolocation on an interactive map.
Use for: Diagnosing slow connections, identifying routing bottlenecks, verifying CDN paths
DNS Lookup
Query A, AAAA, MX, CNAME, TXT, NS, and SOA records for any domain instantly.
Use for: Verifying DNS propagation, debugging email delivery, checking domain configuration
Speed Test
Measure download speed, upload speed, and latency directly from your browser.
Use for: Checking ISP performance, comparing Wi-Fi vs wired speeds, monitoring bandwidth
IP Lookup
Geolocate any IP address and find ISP, ASN, organization, and reverse DNS details.
Use for: Identifying unknown IPs, verifying geolocation, looking up network ownership
Port Scanner
Scan open, closed, or filtered TCP ports on any server using Nmap.
Use for: Auditing firewall rules, verifying service availability, security assessments
SSL Checker
Analyze SSL certificates, TLS protocol versions, and get a security grade.
Use for: Checking certificate expiry, validating TLS configuration, pre-launch audits
How to Choose the Right Network Tool
The right network diagnostic tool depends on the problem you are troubleshooting. Each tool is designed for a specific category of network issue, and using them together can give you a complete picture of what is happening on your network.
Connectivity Issues
If a website or server is unreachable, start with DNS Lookup to verify the domain resolves correctly. If DNS is fine, run a Traceroute to see where packets are being dropped. Use the Port Scanner to confirm the target service port is open and not blocked by a firewall.
Performance Problems
For slow connections, run a Speed Test to measure your actual bandwidth and latency. If speeds are lower than expected, a Traceroute can reveal which network hop is introducing the most delay.
Security Auditing
Before deploying a server, use the Port Scanner to verify only intended ports are exposed. Check your SSL configuration to ensure TLS is properly set up and certificates are valid. Use IP Lookup to investigate suspicious IP addresses in your access logs.