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Network & IP Tools
Subnet, CIDR, IPv4/IPv6 and other network calculations for infrastructure engineers and sysadmins.
- Subnet Calculator (IPv4 CIDR) Enter an IP and CIDR to instantly get the netmask, network, broadcast, host range and total number of addresses.
- IPv6 Subnet Calculator Get the network, address range, total count and compressed/expanded form of any IPv6 prefix.
- CIDR ↔ IP Range Converter Expand a CIDR to its address range, or collapse an IP range into minimal CIDR blocks.
Network & IP guides
All guides →- What Is a Subnet? CIDR Notation Explained Subnets and CIDR notation explained in plain English — what /24 really means, how masks work, and how to divide a network without the headache.
- IPv4 vs IPv6: What's the Difference? Why the internet is slowly moving from IPv4 to IPv6 — the address exhaustion problem, what actually changed, and how the two run side by side.
- What Is an IP Address? What an IP address is and how it routes your traffic — public vs private, static vs dynamic, and why your phone and your router don't share the same one.
- Subnetting Cheat Sheet: CIDR, Masks & Host Counts A no-fluff subnetting reference: the CIDR-to-mask-to-hosts table, the powers-of-two shortcut, and the boundaries people always get wrong.