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Professional network, security, and cloud engineering calculators. Subnet plans, password audits, bandwidth calculations and more. HailBytes Engineering Toolkit is a comprehensive browser extension built for network engineers, security professionals, and cloud architects. ALL CALCULATIONS RUN LOCALLY — no data ever leaves your browser. FREE TOOLS (8): • Subnet Calculator — CIDR notation, network/broadcast addresses, host ranges, subnet masks • IP Address Converter — Decimal, binary, hex conversion with class detection and RFC 1918 private IP check • Password Strength Checker — Score-based analysis with character variety checks and improvement suggestions • Base64 Encoder/Decoder — Encode and decode Base64 with full UTF-8 support • URL Parser — Break down URLs into protocol, host, port, path, query parameters, and hash • Epoch Timestamp Converter — Convert between Unix timestamps and human-readable dates (auto-detects seconds vs milliseconds) • AWS Cost Estimator — Quick monthly and yearly EC2 cost calculations for t3.micro, t3.small, and t3.medium instances PRO TOOLS ($2.99/month — unlock all): • VLSM Calculator — Variable-length subnet masking with automatic allocation sorted by size • Bandwidth Calculator — Data transfer planning with 20% overhead recommendations • DNS Record Reference — Comprehensive guide to A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, PTR, and CAA records • CIDR Range Expander — View all IP addresses in a CIDR block with network/broadcast labels • Hash Generator — Real SHA-256, SHA-1, and MD5 (RFC 1321) hash generation • Common Ports Reference — 55+ ports with service names, protocols (TCP/UDP), and range classification • JWT Decoder — Decode JWT headers and payloads, check token expiration, formatted JSON output • Security Headers Generator — Generate Content-Security-Policy, HSTS, X-Frame-Options for strict, moderate, and API server policies • Network ACL Generator — Generate firewall rules in Cisco IOS, iptables, AWS Security Group, and nftables formats • Multi-Cloud Resource Calculator — AWS, Azure, and GCP compute, storage, and database service comparison • Kubernetes Resource Calculator — Calculate cluster CPU, memory, node count, and 25% overhead recommendations WHY ENGINEERS CHOOSE THIS TOOLKIT: ✓ Privacy-first: All processing happens locally in your browser ✓ No account required for free tools ✓ Cross-browser: Available on Chrome and Firefox ✓ Manifest V3: Built with the latest extension standards ✓ Fast: Instant calculations with no network latency ✓ Professional: Designed by engineers, for engineers PERMISSIONS EXPLAINED: • Storage: Save your preferences and calculation history locally • ActiveTab: Enable right-click context menu for quick subnet calculations • Context Menus: Add "Calculate subnet" option to your right-click menu • Alarms: Run daily cleanup of old usage data (30-day retention) Built by HailBytes — https://hailbytes.com