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IP Subnet Calculator (CIDR Calculator)

Calculate IPv4 subnets from CIDR – network and broadcast address, subnet mask, wildcard, usable host range and count, with binary view.

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What is the IP Subnet Calculator?

Enter an IPv4 address with a prefix (like 192.168.1.10/24) or a subnet mask and get everything you need for network planning: network address, broadcast address, first and last usable host, number of hosts, subnet mask, wildcard mask, IP class and whether the address is private.

Great for network engineers, CCNA students and anyone configuring routers, firewalls and cloud VPCs.

How to use the IP Subnet Calculator

  1. Type an IP address and choose the CIDR prefix (or type it as 10.0.0.1/16).
  2. Read the results and the binary breakdown.
  3. Use Split to divide the network into smaller subnets.

Common prefixes

  • /24 = 255.255.255.0 → 254 hosts
  • /16 = 255.255.0.0 → 65,534 hosts
  • /30 = 255.255.255.252 → 2 hosts (point-to-point)
  • /32 = single host

This IP Subnet Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.

Last updated: · By NodifyTech

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