iSubnet Calculator

iSubnet Calculator is the essential toolkit for network engineers, IT professionals, system administrators, and students. With a clean, modern interface, it handles all your IP addressing and subnetting work in real-time — no more manual binary math or juggling multiple tools. Core Features: IPv4 & IPv6 Subnetting — Calculate network addresses, broadcast addresses, usable host ranges, and wildcard masks instantly Interactive CIDR Calculator — Drag and adjust CIDR sliders to see network size, total addresses, and host counts update live Smart Paste & Parse — Paste any IP address format and the app instantly recognizes and fills it in Unit Converter — Quickly convert between IP notations and formats Number Base Converter — Convert instantly between binary, octal, decimal, and hexadecimal Quick Reference — Built-in subnetting reference tables and cheat sheets Available vs. Total Hosts — Precise breakdowns of usable addresses with standard offset calculations Elegant, Adaptive Design — Beautiful UI optimized for light and dark mode, portrait and landscape Upgrade to Pro for: Subnet Splitter — Split networks using Equal or VLSM (Variable Length Subnet Masking) methods Bulk Subnet Calculator — Process multiple subnets at once Unlimited History & Notes — Keep a complete record of your work, without limits Export Reports & CSV — Generate professional documentation and share your calculations instantly iSubnet Pro is available as an auto-renewing monthly or yearly subscription, or a one-time Lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and can be managed anytime in your App Store account settings. Whether you're studying for a networking certification, managing enterprise infrastructure, or just need a reliable subnet calculator on the go, iSubnet Calculator combines power and simplicity in one polished app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/