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IP Subnet Calculator

Calculate IPv4 network, broadcast, host range, and address capacity from CIDR notation.

IP Subnet Inputs

Results computed instantly — your data never leaves your device.

Subnet Results

Real-Time

Network

192.168.1.0

Broadcast

192.168.1.255

Usable host range

192.168.1.1 – 192.168.1.254

Address / usable host count

256 / 254

100% Client-SidePrivate & Secure

How to Use the IP Subnet Calculator

  1. 1

    Enter a valid IPv4 address.

  2. 2

    Enter a CIDR prefix from 0 through 32.

  3. 3

    Review network, broadcast, and host range values.

  4. 4

    Confirm the address plan with your network documentation before changing production configuration.

Formula & Mathematical Basis

network = address AND subnet mask; total addresses = 2^(32 − prefix).

Variable Key

address

32-bit IPv4 address

prefix

Number of network bits in CIDR notation

📝 For /0 through /30, usable hosts are total addresses minus network and broadcast addresses; /31 and /32 are reported using their full address counts.

Step-by-Step Examples

1

Private /24 network

Scenario: Analyze 192.168.1.42/24.

  1. 1.Apply the 255.255.255.0 mask.
  2. 2.Set host bits to zero for the network.
  3. 3.Set host bits to one for broadcast.
  4. 4.Count 256 addresses and 254 conventional usable hosts.
✅ Network 192.168.1.0, broadcast 192.168.1.255, usable range 192.168.1.1–192.168.1.254.

Practical Use Cases

  • Document a small IPv4 address block.
  • Check host capacity before allocating devices.

Common Pitfalls

  • Confusing prefix length with host-bit count.
  • Using IPv4 rules for IPv6.
  • Assuming every /31 or /32 has two conventional hosts.

Frequently Asked Questions

Does this support IPv6?

No; this route validates dotted-decimal IPv4 only.

Does it configure a router?

No; it only calculates address boundaries client-side.

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