subnet_info

Parse an IPv4 or IPv6 CIDR block: network address, host range, host count, and whether it is a private range. IPv4 also returns broadcast and netmask.

SERVERMcp Nettools SOURCEaaronckj/mcp-nettools

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aaronckj-mcp-nettools/subnet-info.md

WHAT IT DOES

What subnet_info does on Mcp Nettools

AI agents call subnet_info to retrieve information from Mcp Nettools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why subnet_info is rated Low

subnet_info performs read-only analysis of network subnet information. It takes a CIDR notation input and returns calculated metadata (network address, host ranges, counts, private/public classification). This is a pure information retrieval/calculation operation with no capability to modify, execute, delete, or access external systems.

From the tool's definition Tool description states it 'Parse[s] an IPv4 or IPv6 CIDR block' and returns 'network address, host range, host count, and whether it is a private range' — purely informational operations with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs subnet_info safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Nettools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For subnet_info, this is the rule to start with:

subnet_info Allowed

subnet_info is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "subnet_info": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Nettools, apply this rule, and every subnet_info call is checked against it from then on.

FAQ

Questions about subnet_info

What does the subnet_info tool do? +

Parse an IPv4 or IPv6 CIDR block: network address, host range, host count, and whether it is a private range. IPv4 also returns broadcast and netmask. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on subnet_info? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for subnet_info: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp Nettools. Nothing to install.

What risk level is subnet_info? +

subnet_info is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit subnet_info? +

Yes. Add a rate_limit block to the subnet_info rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block subnet_info completely? +

Set action: deny in the PolicyLayer policy for subnet_info. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides subnet_info? +

subnet_info is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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