Summary

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Run make install to install (you'll need root or sudo for this part). Arp-scan is a command-line tool for system discovery and fingerprinting. You will need GNU automake and autoconf, the make utility, an ANSI C compiler (for example gcc or clang), the development header files and libraries, and libpcap version 0.9 or later. DOWNLOAD Free 476 KB.
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This post highlights how the arp (Win) or arp-scan (Linux) commands can be used in conjunction with online MAC address lookup tools, to assist in hardware identification of Ethernet devices.

Predicament
For a software development project a boxed cluster of Single Board Computers (SBC) was provided. The SBC cluster contained systems configured with static and dynamic IP addressing. No issue I mused, each SBC could be powered individually, the SBC that needed to be upgraded could then be identified. The real issue then presented itself, the cluster was boxed hardware and could not be opened and individual boards could not be powered or unpowered. One of the solutions that came to mind was the sometimes overlooked ARP command.

ARP Command (Windows)
Using ARP in the Windows command line may not be the most operator friendly solution, especially if a GUI based application is more your flavour. There are plenty of Windows applications such as the well-known Angry IP Scanner, Nmap or Free IP Scanner which will do a similar task. Some of these applications detail the OEM or hardware manufacturer in the scan results.

For testing with ARP, the SBC box was powered and networked directly to a development computer. Arp-scan

The arp -a command was issued from the Windows command line.

ARP Results

A doctored copy of the results from the arp are shown above. A few dynamic devices were listed.

The first six characters of the MAC address were used to identify the vendors.

ARP Scan Command (Linux)
The arp-scan command used in Linux terminal produces similar results, usually including the hardware vendor.

ARP Scan Results

MAC Lookup
For this SBC project the AskApache website was utilised for identification of the hardware vendor using the MAC addresses. A Google search will throw up numerous sites with similar search functionality, such as MAC Vendor Lookup.

On the AskApache site, the MAC address starting with b8 yielded the target SBC.

AskApache MAC Address Lookup

Results from the website show the target SBC was a Raspberry Pi.

AskApache MAC Address Lookup Result

Using the command line serves as handy reminder to the tools available in most operating systems.

The IEEE oui.txt file has become somewhat inconsistent over the years and subsequently requires subvention for use in network infrastructure documentation and reporting. In response to this we have produced a daily sanitized edition that is available for download in bzip2, gzip, Zip and ASCII text.

Our sanitizing process performs Title Case conversion of legacy all UPPERCASE OUI records, fixes for vendor name inconsistencies, spelling corrections, removal of superfluous and erroneous data artifacts that have crept into the original daily generated IEEE oui.txt over time.

Arp-scan Download For Mac Windows 10

The oui.txt file is located in /usr/share/misc/ on most Linux distributions.

oui.txt Downloads

Sanitized oui.txt.bz2Fri, 29 Jan 2021 03:10:21 -0400 • 863.4 kB (863,380 bytes) • bzip2

Sanitized oui.txt.gzFri, 29 Jan 2021 03:10:21 -0400 • 1.2 MB (1,210,062 bytes) • gzip

Sanitized oui.txt.zipFri, 29 Jan 2021 03:10:21 -0400 • 1.2 MB (1,210,200 bytes) • Zip

Sanitized oui.txtFri, 29 Jan 2021 03:10:21 -0400 • 4.4 MB (4,359,876 bytes) • ASCII

Orig. IEEE oui.txtUpdated daily and available on the IEEE website • ASCII

Sanitized IEEE OUI Data (oui.txt) Update Client Download

Sanitized IEEE OUI Data (oui.txt) Update Client sanitized-oui.txt-update v1.03
Tue, 09 Jul 2019 10:30:12 -0300 • 4.0 kB (4,039 bytes) • bash shell script

oui.txt Comparison

A juxtaposition comparison of the original and sanitized oui.txt files can be attained using sdiff from the GNU diffutils package.

sdiff -Wia original_oui.txt sanitized_oui.txt | less

Nmap MAC Prefixes

We also maintain and have made available a nmap-mac-prefixes file created from the sanitized oui.txt edition with abridging vendor name logic applied.

nmap-mac-prefixes Download

nmap-mac-prefixes Fri, 29 Jan 2021 03:10:24 -0400 • 535.5 kB (535,484 bytes) • ASCII

Nmap MAC Address Scan

The nmap-mac-prefixes file is used by Nmap to output meaningful OUI vendor names for MAC addresses it detects by matching the three-byte prefix taken from the MAC address and looking for a match in nmap-mac-prefixes file. It's also used in other nmap features. The Nmap nmap-mac-prefixes file can typically be found in /usr/share/nmap/ on most Linux distributions.

An example of this can be seen by performing a nmap scan of a local network. In this example the 192.168.0.0/24 LAN segment is scanned using the following:

nmap -n -sP -PS -PE -PP -PM 192.168.0.0/24 | grep MAC
ephor ~ # nmap -n -sP -PS -PE -PP -PM 192.168.0.0/24 | grep MACMAC Address: XX:XX:XX:XX:XX:XX (Cisco)MAC Address: XX:XX:XX:XX:XX:XX (AOpen)MAC Address: XX:XX:XX:XX:XX:XX (ASUS)MAC Address: XX:XX:XX:XX:XX:XX (Intel)MAC Address: XX:XX:XX:XX:XX:XX (Linksys)MAC Address: XX:XX:XX:XX:XX:XX (Dell)MAC Address: XX:XX:XX:XX:XX:XX (Dell)MAC Address: XX:XX:XX:XX:XX:XX (HP)MAC Address: XX:XX:XX:XX:XX:XX (HP)MAC Address: XX:XX:XX:XX:XX:XX (Intel)MAC Address: XX:XX:XX:XX:XX:XX (OKI Electric)MAC Address: XX:XX:XX:XX:XX:XX (D-Link)MAC Address: XX:XX:XX:XX:XX:XX (Kingston)MAC Address: XX:XX:XX:XX:XX:XX (Dell)MAC Address: XX:XX:XX:XX:XX:XX (Brother)MAC Address: XX:XX:XX:XX:XX:XX (Xerox)ephor ~ # _

Arpwatch ethercodes.dat

Arpwatch is an Ethernet monitor tool by Network Research Group (NRG). The ethercodes.dat distributed with the NRG Arpwatch package archive is somewhat dated, Jul 22, 2006. The format of this data file is similar enough to the nmap-mac-prefixes file that it is rather trivial to generate an updated ethercodes.dat from it.

See Updating ethercodes.dat Ethernet vendor codes on the DTU IT Wiki for a working example.

The ethercodes.dat file can be found in /usr/share/arpwatch/ or /var/lib/arpwatch/ on most installations.

ethercodes.dat Download

ethercodes.dat Fri, 29 Jan 2021 03:10:24 -0400 • 623.7 kB (623,720 bytes) • <