MAC Address Generator

Tool Guide

Introduction

The online MAC address random generator can quickly batch generate a specified number of MAC addresses, supporting 3 delimiter forms of MAC addresses.

A single run supports randomly generating up to 10,000 MAC addresses, and the generated addresses are all unique.

A MAC address (Media Access Control address) is the unique identifier of a network interface card (NIC) on a network. A MAC address usually consists of 48 bits (6 bytes), represented in hexadecimal, in the format XX:XX:XX:XX:XX:XX. Here are some rules and characteristics of MAC addresses:

Format: A MAC address is usually represented as 6 groups of two-digit hexadecimal numbers, separated in the middle by a colon (:) or a hyphen (-), for example 00:1A:2B:3C:4D:5E or 00-1A-2B-3C-4D-5E.

First 24 bits (OUI): The first 24 bits (i.e., the first three bytes) are used to identify the device manufacturer and are called the Organizationally Unique Identifier (OUI). Each manufacturer has a unique OUI.

Last 24 bits: The last 24 bits (i.e., the last three bytes) are a unique serial number assigned by the manufacturer to a specific device.

Uniqueness: Each MAC address should be unique worldwide, to ensure that each network interface can be uniquely identified.

Private and public addresses:

Public addresses: usually assigned by the manufacturer, guaranteed to be globally unique.

Private addresses: can be set by the user or the device itself, usually used in local networks, without guaranteeing global uniqueness.

Multicast and unicast:

In a MAC address, the least significant bit of the first 6 bits (24 bits)—the 8th bit of the first byte—is used to distinguish unicast and multicast addresses.

Unicast address: the value of the 8th bit (least significant bit) of the first byte is 0.

Multicast address: the value of the 8th bit (least significant bit) of the first byte is 1.

This means that if the 8th bit of the first byte is even (0), the MAC address usually represents a unicast address; if it is odd (1), it represents a multicast address. This rule allows multicast and unicast addresses to be distinguished by the least significant bit of the MAC address.

Address range:

The valid MAC address range: from 00:00:00:00:00:00 to FF:FF:FF:FF:FF:FF. FF:FF:FF:FF:FF:FF is a broadcast address representing all devices.

These rules ensure that MAC addresses can effectively and uniquely identify devices in network communication.

If you need to look up the manufacturer information of a MAC address, you can use the Online MAC Address Vendor Lookup Tool.