Subnet Calculator MCP Server

Subnet Calculator MCP

Subnet Calculator MCP is a Cloudflare Workers-hosted Model Context Protocol server that calculates IPv4 subnet information from an IP address and CIDR prefix or dotted decimal subnet mask.

Public endpoint

https://subnet-calculator-mcp.zeke-rutledge.workers.dev/mcp

Transport: Streamable HTTP

Authentication: none currently required

Tools

calculate_subnet

Calculates IPv4 subnet details.

Accepted input forms:

{ "address": "192.168.1.10/24" }

{ "address": "192.168.1.10", "prefixLength": 24 }

{ "address": "192.168.1.10", "subnetMask": "255.255.255.0" }

Returns:

• network address
• broadcast address
• subnet mask
• wildcard mask
• first usable host
• last usable host
• total address count
• usable host count
• CIDR prefix
• IP class
• scope: private, public, loopback, link-local, multicast, or reserved
• notes for /31 and /32 networks

Connect from an MCP client

{
  "mcpServers": {
    "subnet-calculator": {
      "url": "https://subnet-calculator-mcp.zeke-rutledge.workers.dev/mcp"
    }
  }
}

Some clients may require explicitly setting the transport type to streamable-http.

Local development

Install dependencies:

npm install

Run type checking:

npm run typecheck

Start a local Cloudflare Workers development server:

npm run dev

The MCP endpoint is available at /mcp on the local Wrangler dev URL.

Deploy

Authenticate with Cloudflare Wrangler if needed:

wrangler login

Deploy to Cloudflare Workers:

npm run deploy

MCP Registry

This repository includes server.json for MCP Registry publication. The registry entry describes the hosted remote server and its Streamable HTTP endpoint.