OT Subnet Calculator

IPAM PRO – MORE THAN A SUBNET CALCULATOR Build a central source of truth for sites, customers, and projects. Manage folders, networks, VLANs, devices, reservations, and multiple addresses per device. The visual address map finds free IPs, while conflict checks, smart groups, and audit history keep data reliable. Share folders with roles, collaborate automatically through iCloud, and protect documentation with snapshots, backups, CSV, and PDF reports. IP Subnet Calculator combines fast IPv4 calculations with professional network planning and a compact IPAM. Calculate network addresses, broadcasts, host ranges, subnet masks, and CIDR prefixes—or document complete sites, customers, and devices. FAST AND ACCURATE • Enter an IPv4 address or CIDR directly • Network, broadcast, first and last host • Usable host count and address classification • Quick selection for common prefixes • Copy and export results IPAM FOR YOUR NETWORKS • Folders and subfolders for sites, customers, or projects • Networks with CIDR, VLAN, location, status, and notes • Devices with hostname, IP, and MAC address • Complete CSV export • iCloud sync across your devices • Share your IPAM and collaborate with others PRO TOOLS • Overlap checks for conflicting networks • VLSM and VLAN planning • CIDR aggregation • IPv6 explorer and prefix comparison • Favorites, history, and folders LEARN AND UNDERSTAND Bit visualization, step-by-step guides, practical scenarios, interactive examples, a quiz, and a cheatsheet help both beginners and network professionals. Core calculators are free. IPAM, collaboration, and advanced tools are available permanently with Pro—no subscription.