MAC Address Lookup MCP server

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

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.

URL-driven lookups

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

Shortened. The full README is on GitHub.