MAC Address Lookup MCP Server

by jasontally-mac Your server? Claim it

answering

MAC Address Lookup is answering right now. Last checked 8 min ago. It exposes 1 tools. Last commit 1 Nov 2026.

Find the organization behind a MAC address or OUI prefix in the IEEE registries. No auth, no key.

Uptime history 31 days of history · worst day 97%

31 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

104 ms

Response time

average over 24h

Stars

last commit 1 Nov 2026

Nothing serious here today

Today is the operative word: we check MAC Address Lookup every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://mac.jasontally.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://mac.jasontally.com/mcp

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://mac.jasontally.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mac.jasontally.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://mac.jasontally.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

lookup

lookup

Resolve a MAC address or OUI prefix to its registered organization using longest-prefix match across the MA-L, MA-M, MA-S, IAB, and CID registries. Reports the block type, address count, registration country, and a link to the full record page. Randomized and locally administered addresses usually have no registered organization.

Endpoints

URL	Transport	State	Latency	Checked
https://mac.jasontally.com/mcp	streamable-http	answering	61 ms	8 min ago

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MAC Address Lookup — questions

Answers built from our own checks of this server.

What can MAC Address Lookup do?

It exposes 1 tools, read directly from the server on our last check. Among them: lookup. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is MAC Address Lookup working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 104 ms. The bar chart above shows every period we have measured.

How do I connect MAC Address Lookup?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does MAC Address Lookup need an API key?

No. MAC Address Lookup completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is MAC Address Lookup?

It answers our handshake in 104 ms on average, which is faster than 92% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is MAC Address Lookup open source?

The code is open source: it is published under the MIT licence, written in JavaScript and 1 stars on GitHub. The licence covers the code in the repository, not the hosted service at mac.jasontally.com, which runs on its operator's own terms.