The Wireshark OUI lookup tool provides an easy way to look up OUIs and other MAC address prefixes. It uses the Wireshark manufacturer database, which is a list of OUIs and MAC addresses compiled from a number of sources. Type or paste in a list of OUIs, MAC addresses, or descriptions below. OUIs and MAC addresses may be colon-, hyphen-,. Fast and easy MAC address lookup on IEEE directory and Wireshark manufacturer database. Search vendor, manufacturer or organization of a device by MAC/OUI address. MAC address - Media Access Control address. MAC addresses - hardware addresses that uniquely identifies each node of a network. It is assigned by the vendor or manufacturer and saved to the device memory. According to the OSI model it is a second-level address.

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Users rarely modify this file, which maps MAC address prefixesto vendor names. Read on for the complete treatment.

Ethernet devices, which have become the dominant networkinterface type, are each programmed with a unique 48-bit identifierknown as a MAC address.This address is placed in ethernet headers toidentify which machine on a local network sent a packet, and whichmachine the packet is destined for. Humans usually represent it as ahex string, such as 00:60:1D:38:32:90.

To assure that MAC addresses are unique in a world withthousands of vendors, the IEEE assigns an Organizationally UniqueIdentifier (OUI)to each company manufacturing ethernet devices. Thecompany must use its own OUI for the first three bytes of MACaddresses for equipment it produces. For example, the OUI of 00:60:1D:38:32:90is 00601D. It can choose the remainingthree bytes however it wishes, as long as they are unique. A counter is thesimple approach. Companies that assign all 16.8 million possible valuescan obtain more OUIs.nmap-mac-prefixes maps each assigned OUI to thename of the vendor that sells them.Example 14.6is a typical excerpt.

Example 14.6. Excerpt from nmap-mac-prefixes

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The first value is the three-byte OUI as 6 hex digits. It isfollowed by the company name. This file is created from the complete list athttp://standards.ieee.org/regauth/oui/oui.txtby transforming it with a simple Perl script.The IEEEalso offers an OUI FAQ at http://standards.ieee.org/faqs/OUI.html.

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Nmap can determine the MAC address of hosts on a local ethernetLAN by reading the headers off the wire. It uses this table to lookup and report the manufacturer name based on the OUI. This can beuseful for roughly identifying the type of machine you are dealingwith. A device with a Cisco, Hewlett Packard, or Sun OUI probablyidentifies a router, printer, or SPARCstation, respectively. Example 14.6, “Excerpt from nmap-mac-prefixes” shows that the deviceat 00:60:1D:38:32:90 was made by Lucent. It is infact the Lucent Orinoco wireless card in my laptop.