Subnet Ninja

Fast CIDR planning for IPv4, IPv6, VLSM, overlap checks, visual subnet trees, and cloud network modes.

Subnet Ninja is a fast subnet planning tool for network engineers, cloud operators, IT students, and builders who need reliable CIDR math without opening a spreadsheet.

Use the free IPv4 calculator to inspect network address, broadcast address, usable host range, subnet mask, wildcard mask, host count, and private/public classification. Paste a CIDR block to fill the address and prefix instantly.

Subnet Ninja Pro unlocks the deeper planning workflow:

• IPv6 prefix calculations
• VLSM planning
• CIDR overlap detection
• Visual subnet tree generation
• AWS, Azure, and GCP network modes
• CSV and JSON export
• Expanded history and workflow tools

A lifetime Pro purchase unlocks Pro features on Apple platforms. Use Restore Purchases on another device signed in with the same Apple account.