MAC Vendor Lookup

Identify the manufacturer behind any MAC address in under a second — no signal required.

MAC Vendor Lookup is a fast, offline tool for IT pros and network engineers who need to know what's on the wire. Type, paste, or scan a MAC address and the app returns the IEEE-registered vendor instantly from a 39,340-row OUI database bundled inside the app.
Nothing leaves your device.

Features
• Single lookup with smart parsing — accepts colons, dashes, dots, no separators, or just the first 6 hex chars
• Camera scanner uses on-device Vision OCR to read MAC addresses from device labels, stickers, and barcodes
• Scan Session mode for racking multiple devices in one sweep, with live preview detection and a running list
• Bulk paste — drop in dozens of MACs at once and export results as CSV via the Share sheet
• Full IEEE OUI database (39,340 vendors) bundled — works on a plane, in a basement, in a Faraday cage
• Bit-level decoding: unicast vs multicast, universal vs locally-administered (U/L bit), randomized/private MAC detection, broadcast, all-zeros
• Modified EUI-64 derivation per RFC 4291 for IPv6 work
• History with relative timestamps, favorites, and per-record notes
• Location and site tags — group lookups by closet, building, IDF, customer site, or job ticket
• Universal app — runs natively on iPhone and iPad with the same feature set
• Torch toggle, tap-to-focus, and low-light boost for reading faded labels in dark racks
• Shortcuts and Siri support — "Look up MAC vendor" works as an App Intent

Built for
• Network engineers tracing rogue or unknown devices on a switch
• Sysadmins and helpdesk staff inventorying gear in closets and IDFs
• MSPs walking customer sites who need to log dozens of devices fast
• Security analysts checking for randomized vs. burned-in MAC addresses
• Field techs and installers identifying APs, phones, cameras, and IoT devices
• Networking students learning the OUI registry, U/L bit, and EUI-64 derivation
• Hobbyists running home labs who want a clean, ad-free utility

Privacy
This app is fully offline. There is no network code in the binary. No accounts, no sign-in, no analytics, no advertising SDKs, no third-party trackers, no telemetry. The OUI database, your history, your notes, your tags — all of it stays on your device. Camera
frames and OCR results never leave the phone. The only permission requested is the camera, and only when you tap Scan.

Built by Choate Labs
A small, focused tools studio. Native iOS, Apple frameworks only — SwiftUI, SwiftData, Vision, AVFoundation. No third-party dependencies. Designed to feel like a first-party Apple utility: fast, quiet, and out of your way.