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IP & Subnet Calculator

IP Address & CIDR

/0/8/16/24/32

Binary Visualization

11000000101010000000000100000000
Network (24 bits)Host (8 bits)

Subnet Details

Network Address192.168.1.0
Broadcast Address192.168.1.255
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
Usable Hosts254
Subnet Mask255.255.255.0
Subnet Mask (Binary)11111111.11111111.11111111.00000000
Wildcard Mask0.0.0.255
IP ClassC
Address TypePrivate

Subnet Splitter

#NetworkCIDRUsable RangeHosts
1192.168.1.0/26192.168.1.1 - 192.168.1.6262
2192.168.1.64/26192.168.1.65 - 192.168.1.12662
3192.168.1.128/26192.168.1.129 - 192.168.1.19062
4192.168.1.192/26192.168.1.193 - 192.168.1.25462

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Programmatic Access

IP & Subnet Calculator is also callable as a free HTTP JSON API at https://aidevhub.io/api/subnet-calculator/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, 50 requests/day per IP. Responses return { ok, tool, result, meta }. 

curl -s "https://aidevhub.io/api/subnet-calculator/?ip=192.168.1.0&cidr=24"

Machine-readable contract: /api/tool/subnet-calculator.json All API endpoints: /agents/ LLM site index: /llms.txt

Agent Invocation

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/subnet-calculator/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/subnet-calculator/ GET subnet-calculator
POST /api/subnet-calculator/ POST subnet-calculator

Unified Runtime API

https://aidevhub.io/api/tools/run/?toolId=subnet-calculator&a=...

GET and POST are supported at /api/tools/run/ with identical validation and limits.

Limit: 60 req / 60s, input max 128 KB.

How to Use IP & Subnet Calculator

  1. 1

    Enter IP and CIDR

    Input an IPv4 or IPv6 address with CIDR notation (e.g., 192.168.1.0/24). The calculator validates and interprets the range.

  2. 2

    Analyze subnet details

    View the network address, broadcast address, usable host range, subnet mask, and total host count in a clear breakdown.

  3. 3

    Perform subnet division

    Split a subnet into smaller subnets by increasing the CIDR value. The tool shows each resulting subnet range and usable IPs.

  4. 4

    Check IP membership

    Test if a specific IP address belongs to your subnet. Useful for firewall rules, access control lists, and security planning.

  5. 5

    Export network plan

    Download a CSV or JSON file with all subnet details, ranges, and calculations for documentation or infrastructure provisioning.

Frequently Asked Questions

What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation like 192.168.1.0/24 specifies an IP address and the number of network bits (prefix length), defining a range of IP addresses in that subnet.
How many hosts in a /24 subnet?
254 usable hosts. A /24 has 256 total addresses (2^8), minus the network address and broadcast address. The tool shows exact host counts for any prefix length.
Can I split a subnet into smaller subnets?
Yes, enter a network and specify how many subnets you need. The tool calculates equal sub-ranges, each with their own network address, broadcast address, and usable host range.
How do I know if an IP is private or public?
The tool auto-detects private ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and clearly indicates whether each address is private or public with a visual badge.
Is this tool free and private?
Yes. Free to use. All subnet calculations happen in your browser. No data is sent to any server.