IP Address & Subnet Calculator

Calculate network address, broadcast, host range, and usable hosts from an IP and CIDR.

Format: x.x.x.x/prefix (e.g. 10.0.0.1/8)

IP Address

192.168.1.50

Subnet Mask

255.255.255.0

Network Address

192.168.1.0

Broadcast

192.168.1.255

First Host

192.168.1.1

Last Host

192.168.1.254

Usable Hosts

254

CIDR Prefix

/24

IP Type

Private (Class C)

Binary representation (32-bit)

IP:11000000.10101000.00000001.00110010
Mask:11111111.11111111.11111111.00000000
Network:11000000.10101000.00000001.00000000

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How it works

Enter an IPv4 address and a CIDR prefix length (e.g. 192.168.1.50/24). The tool computes the subnet mask, network address (bitwise AND of IP and mask), broadcast address (network OR inverse mask), first usable host, last usable host, and total usable host count. It also shows whether the IP is private, public, or a special-purpose address. Everything runs locally in your browser.


              Network = IP & Mask   Broadcast = Network | ~Mask

Common use cases

  • Planning IP address ranges for a new server or home network.
  • Checking whether two IP addresses are on the same subnet.
  • Learning subnetting concepts by exploring different prefix lengths.

Frequently asked questions

Does this support IPv6?

No — this tool covers IPv4 only. IPv6 subnetting follows the same bitwise principles but with 128-bit addresses, which is a separate tool.

What is a CIDR prefix?

CIDR (Classless Inter-Domain Routing) notation appends /N to an IP address, where N is the number of bits in the network portion. /24 = 255.255.255.0 mask, giving 254 usable hosts per subnet.