Networking Tools
Free online networking tools — DNS lookup, HTTP header checker, port scanner, subnet calculator, ping tester, cron parser and more.
IP Subnet Calculator
Calculate IPv4 subnet ranges, host capacity, broadcast address, and CIDR details for network planning.
DNS Lookup
Free DNS lookup tool online - Look up DNS records for any domain instantly. Check A, AAAA, MX, CNAME, TXT, NS, SOA, and PTR records. Perfect for network troubleshooting, domain verification, and DNS analysis. Fast, accurate, completely free DNS query tool.
HTTP Header Checker
Free HTTP header checker online - Check HTTP headers of any website instantly. View response headers, status codes, security headers, and server information. Perfect for web development, security analysis, and debugging. Fast, detailed analysis, completely free tool.
Ping Tester
Free ping tester online - Test network connectivity by pinging any host or IP address instantly. Measure latency, packet loss, and response times. Perfect for network troubleshooting, server monitoring, and connectivity testing. Real-time results, completely free ping tool.
Port Scanner
Free port scanner online - Scan open ports on any host instantly. Check which ports are open, closed, or filtered. Perfect for network security, server administration, and firewall testing. Custom port ranges, fast scanning, completely free. Essential network tool.
Cron Expression Parser
Free cron expression parser online - Parse and validate cron expressions instantly. See when your cron job will run next, understand cron syntax, and test schedules. Perfect for system administrators, developers, and automation. Human-readable output, completely free tool.
Port Checker
Free port checker online - Check if a specific port is open on any IP address or hostname instantly. Test port connectivity, firewall rules, and network accessibility. Perfect for network troubleshooting, server administration, and security testing. Fast, accurate, completely free port tool.
Internet Speed Test
Free internet speed test online - Test your internet connection speed instantly. Measure download speed, upload speed, ping, and latency. Perfect for checking broadband performance, WiFi speed, and network quality. Real-time results, accurate measurements, completely free. Essential network tool.