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pingip.org
pingip.org is a free, browser-based network diagnostic tool that helps users test and troubleshoot internet connectivity in real time. It offers essential utilities with a simple interface — no login or software installation required.
Ping an IP
Send ICMP echo requests to any IPv4 or IPv6 address to check reachability and measure round-trip time (RTT).
Diagnose latency and packet loss
Works with both IPv4 and IPv6
Ideal for server and network testing
Check Port
Test whether a specific TCP port is open or closed on a target IP address — useful for firewall and service checks.
Quickly verify port accessibility
Supports common service ports (e.g. 80, 443, 22)
Helps troubleshoot blocked or misconfigured services
Traceroute
Visualize the path packets take to reach a destination IP, showing each hop and its response time.
Identify slow or failing network segments
Useful for routing and ISP diagnostics
Displays IP and latency per hop
Show Own IP
Displays your current public IPv4 and IPv6 addresses directly in the browser.
Instant visibility of your network identity
Useful for NAT, VPN, and firewall setups
No login or configuration required
mat-calc.com
mat-calc.com is a free, browser-based showcase for numerical mathematics. It offers interactive visualizations of core algorithms used in analysis, linear algebra, geometry, and applied mathematics. Rather than functioning as a calculator, the site presents curated modules that demonstrate how mathematical methods behave — helping users build intuition through dynamic examples.
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