Resolve a MAC address (or bare OUI prefix) to its IEEE-registered hardware vendor. Accepts any format (FC:FB:FB:01:02:03, fc-fb-fb-01-02-03, fcfb.fb01.0203, fcfbfb, or a 9-hex MA-S prefix). Longest-prefix match across the IEEE MA-L/MA-M/MA-S registries, so subdivided blocks resolve to the real ma...
AI agents call net.mac-vendor to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries information from bundled IEEE registries to map a MAC address to its manufacturer. It is purely informational with no side effects, data modification, code execution, or financial impact. The operation is a straightforward read/lookup against static reference data.
From the tool's definition Tool 'Resolve a MAC address... to its IEEE-registered hardware vendor.' Performs lookup and returns vendor name, matched OUI, and decoded address bits with no modification of data or execution of code.
Attacks that exploit this kind of access
Resolve a MAC address (or bare OUI prefix) to its IEEE-registered hardware vendor. Accepts any format (FC:FB:FB:01:02:03, fc-fb-fb-01-02-03, fcfb.fb01.0203, fcfbfb, or a 9-hex MA-S prefix). Longest-prefix match across the IEEE MA-L/MA-M/MA-S registries, so subdivided blocks resolve to the real manufacturer. Returns the vendor, matched OUI + registry, and decoded address bits: multicast/group, locally administered, or randomized (privacy) MAC. Bundled authoritative IEEE data, free. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for net.mac-vendor: 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. Nothing to install.
net.mac-vendor 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 net.mac-vendor 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 net.mac-vendor. 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.
net.mac-vendor is provided by the MCP server (@2sio/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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