Split a CIDR into equal-size child subnets (by new_prefix or power-of-two count).
AI agents call subnet_split to retrieve information from Network MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a network calculation utility that takes network notation (CIDR blocks) and computes derived subnets mathematically. It retrieves or derives information without side effects on any system. No data is created, modified, deleted, or executed. The low severity reflects that misuse cannot cause harm beyond providing incorrect network planning data.
From the tool's definition Tool performs CIDR subnet splitting, which is a purely computational operation on network addressing data.
Attacks that exploit this kind of access
Split a CIDR into equal-size child subnets (by new_prefix or power-of-two count). It is categorised as a Read tool in the Network MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Network MCP Server MCP server in PolicyLayer and add a rule for subnet_split: 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 Network MCP Server. Nothing to install.
subnet_split is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the subnet_split 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.
Set action: deny in the PolicyLayer policy for subnet_split. 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.
subnet_split is provided by the Network MCP Server MCP server (labeveryday/network-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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