# MAC Address Lookup

Find the organization registered to a MAC address or OUI prefix in IEEE registries. Use it when identifying the owner of a network address.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 1
- Author: jasontally
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/jasontally/mac-address-lookup
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/mcp/mac-address-lookup

## What it does

This MCP server looks up the organization associated with a MAC address or its OUI prefix, using IEEE registries as its source. It requires neither an account nor an API key. That makes it handy when you need to identify an address found in network configuration or logs.

You can connect it to Claude Code, Codex, Cursor, GitHub Copilot, and the other listed platforms. For Claude Code, run `claude mcp add --transport http mac-address-lookup https://mac.jasontally.com/mcp`. The connection depends on reaching the MCP server URL.

## Requirements
- Remote server: `https://mac.jasontally.com/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http mcp https://mac.jasontally.com/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add mac-address-lookup --url https://mac.jasontally.com/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "mac-address-lookup": {
            "url": "https://mac.jasontally.com/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "mac-address-lookup": {
            "type": "http",
            "url": "https://mac.jasontally.com/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http mac-address-lookup https://mac.jasontally.com/mcp
```

## When to use it
- identify the organization registered to a MAC address
- look up the owner of an OUI prefix
- check which organization was assigned a network address

## Example prompts
- Find the organization registered to MAC address `00:1A:2B:3C:4D:5E`.
- Look up the owner of OUI prefix `00:1A:2B`.
- Check which organization registered `001A2B3C4D5E`.

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