# Are all MAC addresses 12 digits?

## Are all MAC addresses 12 digits?

How long can a MAC address be?

48 bits
A MAC address consists of 48 bits, usually represented as a string of 12 hexadecimal digits (0 to 9, a to f, or A to F); these are often grouped into pairs separated by colons or dashes.

What is the MAC address FFFF FFFF FFFF used for?

ffff. ffff , this is the special reserved MAC address indicating a broadcast frame. This is what makes an ARP Request a broadcast. Had Host A chosen to send this frame using a specific host’s MAC address in the destination, then the ARP request would have been unicast.

### How long is a MAC address in bytes?

6 bytes
In a LAN, each node is assigned a physical address, also known as a MAC/Ethernet address. This address is unique to each of the nodes on the LAN and is 6 bytes (48 bits) long, which is burned on the Ethernet card (also known as the network interface card).

How long is a IPv6 address?

128-bit
IPv6 uses 128-bit (2128) addresses, allowing 3.4 x 1038 unique IP addresses. This is equal to 340 trillion trillion trillion IP addresses. IPv6 is written in hexadecimal notation, separated into 8 groups of 16 bits by the colons, thus (8 x 16 = 128) bits in total.

How many MAC addresses are left?

This 48-bit address space contains potentially 248 (over 281 trillion) possible MAC addresses. The IEEE manages allocation of MAC addresses, originally known as MAC-48 and which it now refers to as EUI-48 identifiers.

## What is FF FF FF FF FF FF FF?

Can MAC address be all numbers?

MAC addresses are expressed in six hexadecimal values. In any case, because the six values are hexadecimal, they can only be numbers 0–9 and the letters A–F. So, a valid MAC address might be 00-D0-56-F2-B5-12 or 00-26-DD-14-C4-EE.

A valid MAC address must satisfy the following conditions: It must contain 12 hexadecimal digits. One way to represent them is to form six pairs of the characters separated with a hyphen (-) or colon(:). For example, 01-23-45-67-89-AB is a valid MAC address.

### What is the length of a MAC address?

A MAC address is 6 bytes (48 bits) long address in the binary numbers. MAC addresses are written in the hexadecimal format. The hexadecimal format uses the base-16to refer to numbers.

What is an example of a MAC address?

Here is a MAC address example: 00: 1B: 44: 11: 3A: B7. The average user, who is not a computer geek, often confuses the IP and MAC addresses and cannot clearly explain where each of them is used. In fact, they are used simultaneously but have different purposes and meanings.

How many octets are there in a MAC address?

Three octets contain 8 bits like a0, a1, a2, a3, a4, a5, a6, and a7. The important types of MAC address are: 1) UAA (Universally Administered Address), and 2) LAA (Locally Administered Address). UAA is the most used type of MAC address. LAA is an address that changes the MAC address of the adapter.

## What does the first half of a MAC address contain?

The first half (24 BITS) of a MAC address contains the ID number of the adapter manufacturer. These IDs are regulated by an Internet standards body (see sidebar). The second half (24 MORE BITS) of a MAC address represents the serial number assigned to the adapter by the manufacturer. In the example, indicates the manufacturer is Intel Corporation.