MAC Vendor Lookup

An offline-capable IEEE MA-L, MA-M, and MA-S OUI hardware manufacturer lookup, batch MAC normalizer, and Linux NIC/ARP address inspector.
A lightweight Linux alternative to NirSoft MACAddressView for identifying network adapter manufacturers, inspecting IEEE 802 U/L and multicast bits, and searching vendor OUI blocks.

Key features:
- Bundles over 38,000 real IEEE MA-L (24-bit), MA-M (28-bit), and MA-S (36-bit) OUI vendor assignments for 100% offline operation while also loading host /usr/share/ieee-data/oui.txt, /usr/share/misc/oui.txt, and /lib/udev/hwdb.d/20-OUI.hwdb when available.
- Inspects live Linux network interfaces (/sys/class/net/*/address) and ARP table neighbors (/proc/net/arp) automatically.
- Decodes IEEE 802 Universally vs Locally Administered (U/L) and Unicast vs Multicast (I/G) octet bits, normalizes Colon, Hyphen, and Cisco Dotted notations, and computes IPv6 EUI-64 interface identifiers.
- Searches OUI blocks by hardware manufacturer name and exports structured CSV and JSON lookup reports.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by NirSoft or the Institute of Electrical and Electronics Engineers (IEEE).