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Generador de Direcciones MAC

Generar direcciones MAC aleatorias para pruebas y desarrollo

Generador de Direcciones MAC
Generar direcciones MAC aleatorias para pruebas y desarrollo
Direcciones MAC generadas

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1

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2

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3

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MAC Addresses: Hardware Identification in Networks

Key Takeaways

  • MAC (Media Access Control) addresses are 48-bit hardware identifiers assigned to network interface cards for Layer 2 communication.
  • The first 3 bytes (OUI) identify the manufacturer, while the last 3 bytes are device-specific — except in randomly generated addresses.
  • All MAC address generation is performed in your browser — no addresses are stored or transmitted.

MAC addresses are the physical identity of network devices, operating at Layer 2 of the OSI model. Every Ethernet frame and WiFi packet uses MAC addresses for local network delivery. Understanding MAC address structure is essential for network administration, security (MAC filtering), virtualization (VM network config), and troubleshooting connectivity issues at the data link layer.

The 48-bit MAC address space supports 281 trillion unique addresses — enough for every networked device on Earth.

Address Space

Key Concepts

1

MAC Address Structure

A MAC address has 6 octets (e.g., AA:BB:CC:DD:EE:FF). The first 3 octets form the OUI (Organizationally Unique Identifier) assigned to manufacturers. The last 3 are device-specific.

2

Unicast vs. Multicast Bit

The least significant bit of the first octet determines if the address is unicast (0, single device) or multicast (1, group of devices). Randomly generated addresses should set this bit to 0.

3

Local vs. Universal Bit

The second least significant bit of the first octet indicates whether the address is universally administered (0, manufacturer-assigned) or locally administered (1, custom/random).

4

MAC Address Randomization

Modern operating systems (iOS, Android, Windows) randomize MAC addresses when scanning for WiFi networks to prevent tracking. This uses the locally administered bit to distinguish from real hardware addresses.

Pro Tips

Set the locally administered bit (second-least significant bit of first octet) when generating random MAC addresses to avoid conflicting with real hardware.

Use consistent MAC addresses for VMs and containers in development to avoid DHCP lease issues when recreating environments.

MAC filtering provides minimal security — MAC addresses can be easily spoofed. Use 802.1X authentication for real network access control.

Common MAC address formats include colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated (AA-BB-CC-DD-EE-FF), and Cisco format (AABB.CCDD.EEFF).

All MAC address generation is performed entirely in your browser. No generated addresses are stored, logged, or transmitted to any server. Generated addresses are random and not associated with any real hardware.

Preguntas Frecuentes