IP Address Utilities

Cidr To Netmask

Converts CIDR prefix notation to dotted decimal subnet masks for network configuration. Use via MCP in Cursor or Windsurf, or call GET /v1/ip/cidr-to-netmask with a prefix length parameter. For example, /24 becomes 255.255.255.0. Essential for router configs, firewall rules, and network planning where legacy tools expect traditional subnet masks.

API Endpoint

GET /v1/ip/cidr-to-netmask

Code Examples

curl "https://tinyfn.io/v1/ip/cidr-to-netmask" \
  -H "X-API-Key: YOUR_API_KEY"

const response = await fetch('https://tinyfn.io/v1/ip/cidr-to-netmask', {
  headers: { 'X-API-Key': 'YOUR_API_KEY' }
});
const data = await response.json();
console.log(data);

import requests

response = requests.get('https://tinyfn.io/v1/ip/cidr-to-netmask',
    headers={'X-API-Key': 'YOUR_API_KEY'})
data = response.json()
print(data)

Use via MCP

Add to your AI agent

Connect your AI agent (Claude, Cursor, Windsurf, etc.) to TinyFn's ip address tools:

{
  "mcpServers": {
    "tinyfn-ip": {
      "url": "https://tinyfn.io/mcp/ip",
      "headers": {
        "X-API-Key": "YOUR_API_KEY"
      }
    }
  }
}

Learn more about MCP setup →

Related Tools

FAQ

How do I convert CIDR /24 to subnet mask format?

Pass the prefix length (24) to get 255.255.255.0. The tool converts any valid CIDR from /0 to /32 into dotted decimal notation.

What subnet mask does CIDR /28 produce?

CIDR /28 converts to subnet mask 255.255.255.240, which allows 16 IP addresses (14 usable hosts) per subnet.

Can MCP agents use this for network automation scripts?

Yes, AI agents in Cursor or Cline can call this tool to generate subnet masks for router configurations, Ansible playbooks, or infrastructure-as-code templates.

Does this handle edge cases like /0 and /32 CIDR notation?

/0 returns 0.0.0.0 (all networks), /32 returns 255.255.255.255 (single host). All values from 0-32 are supported.

Why use this instead of manual CIDR calculation?

Eliminates binary conversion errors and provides instant, deterministic results for network planning, especially when processing multiple subnets or integrating with legacy systems.

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