Developer
Developer Utilities
Browser-based networking, password, and encoding tools. Every tool includes its formula, a worked example, limitations, FAQs, and references.
IPv4 Subnet Calculator
Find an IPv4 network, mask, broadcast address, and host count.
Secure Password Generator
Generate a random password locally with the Web Crypto API.
Base64 Encoder and Decoder
Encode Unicode text as Base64 or decode valid Base64 text.
URL Encoder and Decoder
Encode or decode a URL component safely in your browser.
Using these tools responsibly
Start with consistent units and realistic inputs. Treat estimates as planning aids and confirm decisions involving safety, regulation, tax, academic policy, or substantial cost with an authoritative source.