OldWeb Tools
Fast, simple, offline-ready utilities for network engineers and system administrators
Quick Access
Network Tools
IP and subnet calculators, CIDR converters, and network planning utilities for network engineers.
Subnet Calculator • IPv6 Subnet Calculator • Subnet Planner • CIDR Converter • Bit Calculator • Data Transfer Calculator
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System Tools
Unix/Linux system administration utilities including permissions, cron scheduling, disk planning, and log analysis.
Chmod Calculator • Cron Builder • DISK Tools • IOPS Calculator • Password Generator • Regex Tester • Log Timestamp Converter
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Data Tools
Data encoding, hashing, and format conversion utilities for developers and security professionals.
Base64 & Hash Tools
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Financial Tools
Loan and mortgage calculators for financial planning, payment schedules, and interest analysis.
Amortization Calculator
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Productivity Tools
Time management and focus utilities to help you stay productive and organized.
Pomodoro Timer
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PDF Tools
Edit PDFs entirely in your browser. No uploads, no watermarks, no signup — your file never leaves this tab.
PDF Merge • PDF Split • PDF Rotate
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