# IP Subnet Calculator MCP

> IP Subnet Calculator MCP handles network addressing math flawlessly. Pass an IP and a CIDR prefix, and it returns the precise network ID, broadcast address, and total usable host count. Forget relying on general-purpose AI for binary arithmetic; this tool gives you verifiable subnet boundaries every time.

## Overview
- **Category:** developer-tools
- **Price:** Free
- **Tags:** network-math, broadcast-address, subnet-mask, ip-ranges, binary-arithmetic

## Description

Network planning requires absolute precision—you can't guess at bitwise math or expect a large language model to handle complex CIDR calculations reliably. This MCP solves that problem by giving your agent a dedicated, mathematical engine. You just feed it an IP address and the mask (or prefix), and it calculates all the necessary boundaries: the network ID, the broadcast address, and the exact count of usable hosts.

It's straightforward. Whether you're segmenting a new VPC or verifying existing ranges, this tool gives you immediate, reliable data points for your infrastructure plan. Since Vinkius hosts this MCP, you connect it once to any compatible agent—Claude, Cursor, Windsurf, etc.—and get access to this utility alongside thousands of others. It takes the guesswork out of IP allocation and keeps your network design clean.

## Tools

### calculate_ip_subnet
Calculates the network address, broadcast address, first host, last host, and total usable hosts from an IP and CIDR prefix.

## Prompt Examples

**Prompt:** 
```
Calculate the exact network bounds for CIDR block 192.168.1.0/24.
```

**Response:** 
```
✅ **Subnet Data:**
Network ID: `192.168.1.0`
Broadcast: `192.168.1.255`
Usable Hosts: `254`
```

**Prompt:** 
```
Check mathematically if the IP 10.0.5.50 falls within the 10.0.0.0/16 subnet.
```

**Response:** 
```
✅ **Status:** Included. The IP sits safely within the allowed host range.
```

**Prompt:** 
```
What is the subnet mask for a /28 CIDR notation?
```

**Response:** 
```
✅ **Subnet Mask:** `255.255.255.240`
```

## Capabilities

### Determine full subnet boundaries
Provides the exact network address range, broadcast address, and usable host count for a given IP block.

## Use Cases

### Planning a new data center segment
A Network Architect needs to allocate 500 IPs for a new department. Instead of manually checking the mask, they prompt their agent: 'Calculate the network boundaries and usable hosts for 172.16.10.0/24.' The `calculate_ip_subnet` tool immediately returns the safe range (Network ID, Broadcast) and confirms the exact host count.

### Debugging overlapping VLANs
A DevOps Engineer notices two systems claiming similar IPs. They run a check against their agent: 'Does 10.5.2.3 fall within the 10.5.0.0/16 subnet?' The tool confirms inclusion, helping them isolate which system is incorrectly configured.

### Auditing network compliance
A Security Analyst must prove that a specific IP address used by legacy equipment falls within an approved range. They use the MCP to check if the IP sits safely inside the established subnet, providing auditable proof of placement.

### Determining broadcast addresses
The team needs to know the maximum broadcast address for a given block (e.g., 192.168.5.0/27). The agent calls `calculate_ip_subnet`, which instantly returns the precise broadcast address, preventing accidental packet loss or misconfigurations.

## Benefits

- Verify subnet boundaries instantly. Use `calculate_ip_subnet` to get the network ID and broadcast address for any given CIDR block, eliminating guesswork.
- Model host capacity precisely. You don't just get a range; you get the total count of usable hosts, which is critical for accurate resource planning.
- Avoid LLM math errors. The dedicated `calculate_ip_subnet` tool performs pure binary arithmetic, giving you results that are mathematically provable and reliable.
- Validate infrastructure plans quickly. Test if a given IP falls within an intended subnet mask to ensure your design is logically sound before building it out.
- Standardize documentation. Automatically generate the full list of network boundaries and usable host ranges for compliance reports using this MCP.

## How It Works

The bottom line is, it replaces manual, error-prone subnet math with a single function call.

1. You pass your agent an IP address and the corresponding CIDR prefix or subnet mask.
2. The MCP runs the calculation, performing precise binary arithmetic to map the network boundaries.
3. Your agent receives a clean data payload containing the Network ID, Broadcast Address, and usable host range.

## Frequently Asked Questions

**How do I use calculate_ip_subnet to find the broadcast address?**
Pass the IP and the CIDR prefix to `calculate_ip_subnet`. The output data payload will explicitly include the Network ID, Broadcast Address, and usable host count for that block.

**Does calculate_ip_subnet work with subnet masks?**
Yes. You can pass both the IP address and the specific subnet mask alongside the prefix notation to ensure maximum flexibility in your calculations.

**Is this MCP better than using a network calculator website?**
Because it's integrated into your agent, you get verifiable, structured data directly within your workflow. You don't have to copy and paste results between browser tabs or external sites.

**What if I only know the IP range but not the CIDR?**
The tool requires a defined CIDR prefix (like /24). If you only have an IP range, you'll need to determine the mask first, or use another method to define the block.

**What specific network boundaries does calculate_ip_subnet return besides just the broadcast address?**
It provides the Network ID, the Broadcast address, and both the first and last usable host addresses. This gives you a complete, mathematically precise view of the entire allocated IP range.

**How does calculate_ip_subnet handle invalid IP addresses or non-standard CIDR masks?**
The MCP performs strict mathematical validation on all inputs before running the calculation. If you provide an improperly formatted address, it returns a clear error message telling you exactly what needs fixing.

**Are there any rate limits when calling calculate_ip_subnet repeatedly?**
Vinkius handles high volumes of requests efficiently behind the scenes. The MCP is designed for repeated, reliable calculations without running into typical throttling issues you see with basic online tools.

**Can calculate_ip_subnet process different formats for defining network boundaries?**
Yes. You can pass either a standard subnet mask (like 255.255.255.0) or the CIDR prefix notation (like /24). The tool accepts both to accurately define your network size.

**Does it calculate CIDR?**
Yes, full CIDR support.

**Can it list all IPs in a subnet?**
It provides the exact network bounds, broadcast, and total usable hosts.

**Does it support IPv6?**
Currently strictly focused on absolute mathematical precision for IPv4 CIDR blocks.