OUI Lookup
Look up IEEE OUI vendor assignments from a local database with automatic extraction from MAC addresses.
Enter an OUI (00:1A:2B, 001A2B) or full MAC address — the OUI is extracted automatically. Local database contains 55 curated assignments. Run npx tsx scripts/update-oui.ts to refresh from IEEE.
What is OUI Lookup?
OUI lookup maps the first 24 bits of a MAC address to the registered IEEE organization, helping identify equipment manufacturers from address prefixes.
How it works
Provide an OUI or full MAC. PacketWizard extracts the vendor prefix and matches it against a local IEEE assignment database.
Common issues
Unknown or private OUIs
Some prefixes are unregistered, outdated, or locally administered. An empty vendor result is not always a tool error.
Frequently asked questions
Should I use OUI Lookup or MAC Address Lookup?
Use MAC Address Lookup for full address normalization and bit flags. Use OUI Lookup when you only have a vendor prefix or want a focused vendor query.
Related tools
Continue with these related PacketWizard tools for adjacent diagnostics.