mac_lookup

Look up the vendor/manufacturer for a MAC address (OUI database).

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/mac-lookup.md

WHAT IT DOES

What mac_lookup does on Mcp Nettools

AI agents call mac_lookup 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 mac_lookup is rated Low

This tool purely retrieves static information from a public OUI database without modifying any data, executing code, or triggering external actions. The output is vendor/manufacturer metadata associated with a MAC address prefix. There is no destructive capability, financial impact, or code execution involved. The information retrieved is publicly available and looking it up poses minimal security risk.

From the tool's definition Tool performs a lookup in the OUI (Organizationally Unique Identifier) database to retrieve vendor/manufacturer information for a given MAC address.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mac_lookup 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 mac_lookup, this is the rule to start with:

mac_lookup Allowed

mac_lookup 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": {
    "mac_lookup": {}
  }
}

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 mac_lookup call is checked against it from then on.

FAQ

Questions about mac_lookup

What does the mac_lookup tool do? +

Look up the vendor/manufacturer for a MAC address (OUI database). 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 mac_lookup? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for mac_lookup: 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 mac_lookup? +

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

Can I rate-limit mac_lookup? +

Yes. Add a rate_limit block to the mac_lookup 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 mac_lookup completely? +

Set action: deny in the PolicyLayer policy for mac_lookup. 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 mac_lookup? +

mac_lookup 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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