# IP & CIDR Validator MCP

> The IP & CIDR Validator instantly handles binary math for network addresses. It validates both IPv4 and IPv6 formats and mathematically checks if a given IP falls within a specified CIDR subnet range. This is mandatory for any AI agent dealing with firewall rules or access control lists.

## Overview
- **Category:** loved-by-devs
- **Price:** Free
- **Tags:** binary-math, subnet-calculation, firewall-rules, network-security, ip-addressing

## Description

Your cybersecurity agents need more than natural language understanding; they need deterministic math. When an agent processes firewall logs or configuration files, it can't afford to guess if an IP address belongs in the allowed subnet. This MCP solves that problem entirely by running precise binary arithmetic on your behalf. It handles both IPv4 and IPv6 calculations, confirming network boundaries down to the bit level.

Instead of risking security gaps because your AI client guesses a range match, you feed this data through our Validator. The tool processes the IP string against the CIDR block and returns an undeniable true or false result for the subnet match. Connecting it via Vinkius lets any compatible agent run these complex network checks as part of its standard workflow. It ensures that every allow/block decision your system makes is based on strict, verifiable networking rules.

## Tools

### validate_ip
Checks if an IP string is valid and performs binary subnet math to see if it matches a specified CIDR range. This works for both IPv4 and IPv6.

## Prompt Examples

**Prompt:** 
```
Check if the IP `192.168.1.150` belongs to the allowed subnet `192.168.1.0/25`.
```

**Response:** 
```
IP Validation: IP is IPv4. Subnet match is false.
```

**Prompt:** 
```
Is this a valid IPv6 address? `2001:0db8:85a3:0000:0000:8a2e:0370:7334`
```

**Response:** 
```
IP Validation: Parsed successfully as IPv6.
```

**Prompt:** 
```
Verify if this IP string from the log is valid.
```

**Response:** 
```
IP Validation: Successfully parsed.
```

## Capabilities

### Validate IP Format
Confirms whether an input string is a valid IPv4 or IPv6 address.

### Calculate Subnet Boundaries
Determines the network address, broadcast range, and host limits for a given CIDR block.

### Check IP Containment
Compares an individual IP against a subnet to confirm if it falls within the allocated range.

## Use Cases

### Analyzing Firewall Logs
A SOC Analyst is processing a batch of firewall logs and needs to know if the source IPs listed belong to an authorized corporate subnet. They ask their agent, which uses `validate_ip`, to check each IP against the allowed range (`10.0.0.0/8`), immediately flagging any external or unauthorized addresses.

### Configuring New Services
A DevOps Engineer is setting up a new microservice and needs to ensure its assigned internal IPs fit within the allocated subnet block. Running `validate_ip` validates the IP against the CIDR, preventing service deployment with bad addressing.

### Cross-Cloud Network Mapping
A Network Engineer is comparing network topologies across two different clouds. They use this MCP to programmatically confirm that every listed IP range on both sides adheres to the required subnet structure, catching discrepancies instantly.

### Threat Hunting Investigations
An analyst receives a suspicious log containing many potential IPs. Using `validate_ip`, they can quickly filter out invalid or malformed addresses and focus only on those that are mathematically valid within known network segments.

## Benefits

- Stops false positives. Instead of relying on LLMs to 'guess' if an IP is in a range, the `validate_ip` tool gives you a definitive mathematical answer.
- Handles both IPv4 and IPv6 natively. You don't need two separate tools or libraries; this MCP covers all current addressing schemes.
- Reduces security risk at deployment time. Network teams can use this to verify that newly configured subnets are correctly defined before pushing rules live.
- Deterministic output. The results you get back from `validate_ip` are based on strict RFC standards, making the outcome reliable for audit logging and compliance checks.
- Saves development cycles. Your agent doesn't need complex IP address handling code; it just calls this MCP to get validated data.

## How It Works

The bottom line is you get deterministic networking logic that doesn’t require complex custom code.

1. Pass the target IP address or CIDR notation string into this MCP.
2. The tool executes binary arithmetic, calculating the mathematical relationship between the two network strings.
3. Your AI client receives a structured output confirming the validation status (e.g., 'Match: True' or 'Invalid: False').

## Frequently Asked Questions

**How do I use the validate_ip tool with IPv6 addresses?**
The `validate_ip` function handles both IPv4 and IPv6 seamlessly. Just pass the full IPv6 address and its CIDR block as strings; the MCP manages the underlying binary math for you.

**Is validate_ip only for checking if an IP is valid, or can it check subnets?**
It does both. It first validates the format of the input string and then performs the advanced subnet calculation to determine containment within a specified CIDR block.

**Can I use validate_ip in my CI/CD pipeline for network checks?**
Yes. Since it returns deterministic boolean results, you can easily integrate `validate_ip` into automated pipelines to fail the build if any defined IP range is invalid or improperly configured.

**Does validate_ip handle reserved IPs correctly?**
The tool adheres to established networking standards. It performs accurate mathematical checks for reserved, private, and public ranges as defined by RFC guidelines.

**What is the setup process for using the validate_ip tool with my AI client?**
Setup is straightforward; you just connect your MCP-compatible agent through Vinkius. Because this functionality runs locally within the agent environment, no external credentials or keys are required to use validate_ip.

**If I run validate_ip with a malformed IP string or CIDR block, how does it report the error?**
It provides clear failure feedback. The result explicitly tells your agent why the input failed validation—whether it's syntax, format, or mathematical impossibility.

**Is validate_ip optimized for checking many IPs and subnets in a single batch process?**
Yes, it handles bulk input efficiently. You can pass lists of addresses to validate them against multiple subnet rules simultaneously, making it ideal for log analysis.

**When using the validate_ip tool, does it accurately distinguish between public and private IP address ranges?**
Yes, absolutely. It recognizes both types of addressing schemes. This distinction is critical because your agent needs to treat private subnet rules differently than those for publicly routed IPs.

**Does it support IPv6?**
Yes, it fully supports parsing and subnet matching for both IPv4 and IPv6 standard formats.

**What happens if I pass an invalid IP?**
The engine will safely catch the error and return a validation failure, preventing the agent from proceeding with bad data.

**Does it connect to the network to ping the IP?**
No. All checks are mathematical format and binary range checks performed entirely local.