DevOps

CIDR Subnet Calculator

Perform quick IP subnet calculations, inspect network masks, usable ranges, and binaries. Split subnets visually — running 100% locally in your web browser.

Subnet Details

CIDR Notation
192.168.1.0/24
Subnet Mask
255.255.255.0
Network Address
192.168.1.0
Broadcast Address
192.168.1.255
Usable Host Range
192.168.1.1 - 192.168.1.254
Total Usable Hosts
254

Binary Representation

Network Address
11000000.10101000.00000001.00000000
Subnet Mask
11111111.11111111.11111111.00000000

Visual Subnet Splitter

Split your CIDR block into smaller subnets.

Split into:
#1192.168.1.0/26
Range: 192.168.1.1 - 192.168.1.62
#2192.168.1.64/26
Range: 192.168.1.65 - 192.168.1.126
#3192.168.1.128/26
Range: 192.168.1.129 - 192.168.1.190
#4192.168.1.192/26
Range: 192.168.1.193 - 192.168.1.254

How to Use

  1. 1

    Enter base IP

    Type standard IPv4 network address in the IP field.

  2. 2

    Choose CIDR size

    Select target prefix size (e.g. /24) to calculate subnets.

  3. 3

    Analyze range

    Check the Usable Range, Network, Broadcast, and Host totals below.

  4. 4

    Visual Splitter

    Choose a target prefix size to dynamically split your subnet range visually.

Frequently Asked Questions

Is my subnet architecture secure on this tool?+

Yes. All calculations process in Javascript inside your web browser. No network API calls are made — your network configuration never leaves your machine.

What is CIDR?+

Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and IP routing. It replaces the legacy class-based IP system with custom subnet sizes (represented by a slash and prefix number).

What does a /24 subnet mean?+

A /24 subnet mask allocates 24 bits for the network prefix and 8 bits for host addresses. This is represented as 255.255.255.0 and allows up to 254 usable host addresses.