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What is MAC address
Media access control, also known as MAC addresses, is a physical address that actually belongs to the device itself and is assigned by its suppliers. The address consists of 48 bits, is represented by 6 octets (8 bits/1 bytes) separated by a double colon, and is displayed as a hexadecimal value instead of a binary/decimal representation. This address is used together with IP (Internet Protocol) to determine the destination and source address of the data packets transmitted in the network (including the Internet).
The MAC address itself is actually composed of two parts
The first three octets are called OUI or organization-unique identifiers, which tell us who the vendor of the device is actually.
However, the last three octets are often referred to as vendor-assigned IDs, which will allow the vendor to identify that particular device.
The MAC address is ultimately the main component of the Ethernet protocol at the Data Link Layer, which is the top layer of most packets transmitted in the network and is well seen when checking packets using Wireshark and other monitoring software.
For example, under Windows, we can use ipconfig/all to view the MAC address of this machine 
Get Setup Manufacturer based on MAC
. You only need to copy the OUI part of the MAC address and query it in this website https://www.wireshark.org/tools/oui-lookup.html!
OUI Find Tool
The Wireshark OUI lookup tool provides an easy way to find OUI and other MAC address prefixes. It uses the Wireshark manufacturer database, a list of OUI and MAC addresses compiled from multiple sources.