MAC Address Lookup

Name: MAC Address Lookup
Author: jasontally

by jasontallyversion 1.0.0i★ –iRuns in the cloud

Registry namecom.jasontally.mac/mcp

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mac.jasontally.com/mcp

Run this in your terminal

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

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mac.jasontally.com/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain mac.jasontally.com (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

More stars than 0% of the other 32678 servers in this category
Published to the registry more recently than 53% of the other 32678 servers in this category
Basic checks equal to or better than 100% of the other 32678 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MAC Address Lookup safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 35 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Starreel

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

MAC Address Lookup

Free, fast, client-side MAC address vendor lookup. Paste a full or partial MAC address (OUI prefix, MA-M, MA-S, IAB, or CID block) and instantly identify the organization behind it — everything runs in your browser with no backend. We ask nothing of you: no ads, no cookies, no account, no tracking. The project came out of frustration with lookup pages wrapped in intrusive advertising: identifying a MAC vendor is a small utility, and it should be possible to build and host it for close to nothing.

[mac.jasontally.com](https://mac.jasontally.com)

The app does no tracking: there are no ads, no cookies, and every lookup runs in your browser, where the addresses you look up are never processed by a server. Normal requests still reach the host as with any website — a direct link such as /apple carries the term in its URL path, and the app fetches its public data files by URL — but the host only serves static files and runs no search code. The site is hosted on Cloudflare, which collects privacy-first, aggregate web analytics (Cloudflare Web Analytics) that use no cookies or client-side state and do not fingerprint individuals.

Features

Full or partial lookup — works with complete 48-bit addresses or just the leading hex digits (00:1A:2B, 001A2B3, 001A2B3C4)
Any format — colons, hyphens, Cisco dots, spaces, or plain hex; input is normalized automatically
Complete IEEE registry coverage — MA-L, MA-M, MA-S, IAB, and CID assignments, matched with longest-prefix precedence so small blocks resolve to the correct organization
Randomized MAC detection — flags locally administered / privacy-randomized addresses instead of returning a misleading "unknown vendor"
VM & hypervisor detection — recognizes VMware, VirtualBox, Hyper-V, KVM, Docker, Xen, and similar ranges
IEEE block details — assignment type, block size, address range, registered country, and organization details
Prefix lineage — for prefixes that changed hands (acquisitions, renames), a timeline of organizations and when each change was first observed. Shown only for the exact matched prefix, never inherited from parent or child blocks.
Paste anything — drop CLI output (arp -a, switch tables, logs) into the search box; every full MAC address inside is extracted and looked up, with non-address text ignored
Vendor and former-owner search — type a company name to list its prefixes; names from lineage match too ("Tekelec" finds the prefix that became Oracle), plus country names ("Germany"), registry types, and registration years
Registration dates and portfolios — first-registered dates for every prefix, and per-vendor block/address-space totals
Format conversions — see the address in every common notation
URL-driven lookups — no pasting required: mac.jasontally.com/001A2B renders the result directly. Batch lookups and vendor searches work the same way.
Static & private — the IEEE dataset loads in the browser; all searching, processing, and presentation happen locally, and the addresses you look up are never processed by a server. The app sets no cookies. The host (Cloudflare) collects privacy-first, cookieless, aggregate web analytics (Cloudflare Web Analytics).
Dark mode — follows your system preference by default, with a manual toggle
History, copy & share — recent lookups are stored locally; results are copyable and permalinked

URL-driven lookups

Navigate directly to a result — no form submission needed. Everything after / is the query (address, prefix, vendor/country/former-owner text):

URL	Result
`https://mac.jasontally.com/001A2B`	OUI / prefix lookup
`https://mac.jasontally.com/001B213C4D5E`	Full address lookup
`https://mac.jasontally.com/001A2B,005056`	Batch lookup (comma-separated, cap 250)
`https://mac.jasontally.com/apple`	Vendor search
`https://mac.jasontally.com/tekelec`	Former-owner search
`https://mac.jasontally.com/vendor`	Vendor index: every organization with two or more registered blocks
`https://mac.jasontally.com/vendor/apple-inc`	Vendor page: every block registered to one organization
`https://mac.jasontally.com/country/us`	Country page: every organization with registered blocks
`https://mac.jasontally.com/country`	Dimension index rollups: `/country`, `/year`, `/region`, `/history`, `/successor` (each is its own table over the corresponding page family)
`https://mac.jasontally.com/former/apple-computer`	Former-owner page: what happened to each renamed/reassigned block
`https://mac.jasontally.com/?q=001A2B`	Legacy form (canonicalizes to `/001A2B`)

The page consumes the value from the URL path and displays the result without any manual input.

Pre-rendered pages

A build step pre-renders a real HTML page for every registered IEEE assignment — each OUI (MA-L), MA-M, MA-S, IAB, and CID prefix — so that people can find the tool when they look up a prefix or a vendor in their own words. Every page contains the vendor record without requiring JavaScript, and the interactive tool hydrates on top to resolve everything else in the browser: full addresses, partial prefixes, batch lists, vendor names, former owners, countries, and registration years. No brand is promoted as part of the app; the title is translated into local words for each language, because an English-only brand name would make it harder to find for everyone else. Generated pages include canonical URLs, schema.org metadata, sitemap.xml, and robots.txt. Sitemap: https://mac.jasontally.com/sitemap.xml.

On top of the prefix pages, the build generates vendor pages (/vendor/ , every block registered to one organization — roughly 3,500 today), country pages (/country/ , every organization with blocks registered in a country — roughly 130), former-owner pages (/former/ , roughly 350), and registry/year/region/history/successor dimension pages (/registry, /year, /region, /history, /successor), each family behind its own rollup index — `/vendor` (every organization with two or more blocks) and `/country` (every country) are both in the sitemap. The hub pages are complete static tables with no row caps, plus an internal relational link web: related-prefix sections (same vendor, adjacent prefixes, same registration year) on every prefix page, hub links from prefix pages, org directory links on country pages, and the home page's "MAC address by" nav reaching every rollup index. Rationale and capacity accounting: docs/thin-content-mitigation.md.

Data sources

IEEE Registration Authority — MA-L, MA-M, MA-S, IAB, and CID CSV registries (current assignments)
runZero mac-tracker — historical assignment changes back to ~1998, derived from IEEE snapshots and Wireshark/Ethereal archives (MIT)

Using the data from scripts, agents, and LLMs

llms.txt describes the site and data files for AI tools.
/.well-known/ai-catalog.json and /.well-known/ard.json are ARD 1.0 catalogs whose single entry describes the MCP server below. Real JSON at those paths also prevents the SPA fallback from serving HTML there.
Full download: data/registry.ndjson (~13.6 MB, one JSON object per IEEE assignment) and data/lineage.ndjson (ownership-change events). If your client cannot speak MCP, match the longest registered prefix against these yourself.
MCP server: /mcp is a stateless MCP server over Streamable HTTP. No key, no auth, no session, and no handshake required: a current client posts a request directly. It also answers an initialize probe statelessly, so a 2025-era client can connect too, and refuses an unsupported protocol version with -32022 listing what it does speak. A GET that sends Accept: text/event-stream gets an SSE stream for clients that still probe the old transport; any other GET gets 405. One tool, lookup, takes a MAC address or OUI prefix and returns the registered organization, block type, address count, country, and a link to the record page in one call. Served by a Cloudflare Snippet (mcp/snippet.js, generated by build/mcp-shards.mjs); see docs/mcp-endpoint.md.
Auth discovery: /.well-known/oauth-protected-resource and /.well-known/oauth-protected-resource/mcp return RFC 9728 metadata naming no authorization server, because the endpoint is public and no token is ever presented.
Directory and registry listings: server.json at the repository root is the document the official MCP Registry publishes, and /.well-known/mcp/server-card.json is the same document at the path clients probe for pre-connection discovery (SEP-1649). test/mcp-listing.test.mjs keeps the two copies identical. Where the server can be listed, what each place checks, and the steps that need the account holder: docs/mcp-listing.md.
Load and correctness testing: npm run mcp:load drives the live endpoint with a real request mix and validates every response against a brute-force oracle built from registry.ndjson, so a fast wrong answer counts as a failure. See docs/mcp-endpoint.md → *Load and correctness testing*.

Tech stack

Static HTML/CSS/JavaScript — no backend at runtime; all lookup work happens in the browser
Single client bundle built with esbuild (engine + Hyparquet inlined): ~91 KB JS / ~18 KB CSS, gzip-served by Cloudflare
IEEE dataset stored as Apache Parquet and read in-browser with Hyparquet (pure JS, zero dependencies) — sharded by prefix so a lookup fetches a few KB instead of the full registry; no database or API
Pre-rendered prefix pages generated at build time so people can find the tool when they look up a prefix or a vendor — vendors, countries, former owners, and other registration dimensions get the same treatment (see above)
Deployed on Cloudflare Workers Static Assets (custom domain: mac.jasontally.com)
Architecture, platform constraints, and capacity planning: docs/architecture.md
Design language and UX requirements: docs/design.md

License

MIT

MAC Address Lookup

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Starreel

README from the maker

MAC Address Lookup

Features

URL-driven lookups

Pre-rendered pages

Data sources

Using the data from scripts, agents, and LLMs

Tech stack

License