Series & Parallel Resistor Network Solver
Build a combination resistor network by adding series/parallel groups and get total resistance. Visual circuit.
UD5 Toolkit
Build a combination resistor network by adding series/parallel groups and get total resistance. Visual circuit.
Send HEAD requests to popular websites and measure the round‑trip time. Quick network health check. Client‑side.
Simulate a traceroute by entering a destination IP. Learn about AS paths and latency. Does not send real packets; educational visualisation.
Test how your page loads under slow, 3G, or offline conditions by intercepting fetch and applying delays. No DevTools needed.
Measure your internet connection speed by downloading and uploading a small test file. Works from your browser.
Attempt to detect your current DNS resolver IPs using DNS‑leak test queries. Educational. Privacy‑friendly.
Generate valid, random unicast MAC addresses for testing or spoofing. Select OUI prefix if desired. Local only.