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★ MAC address definition


MAC (Media Access Control or Medium Access Control) address, meaning translation for the media access control, or called the physical address, hardware address, used to define the location of network equipment. In the OSI model, the Layer 3 network layer is responsible for the IP address and the second layer data link layer is responsible for the MAC address. So a host will have a MAC address, and each network location will have a dedicated IP address.
MAC address is determined by the card, is fixed.

MAC Address (MAC Address)

MAC (Medium / Media Access Control) address, used to represent each site on the Internet identifier, using hexadecimal number, a total of six bytes (48). The first three bytes are the code (high 24 bits) assigned by the IEEE registrar RA to the different manufacturers, also known as the "Organizationally Unique Identifier", the last three bytes (Low 24) by the manufacturers themselves assigned to the production of the adapter interface, known as the extension identifier (unique). An address block can generate 224 different addresses. The MAC address is actually the adapter address or the adapter identifier EUI-48.

MAC (Media Access Control) address, also known as the hardware address, the length is 48 bits (6 bytes), by the hexadecimal number, divided into the first 24 and 24:


The first 24 bits are called Organizationally Unique Identifier (OUI), which is assigned by the IEEE registry to different manufacturers to distinguish between different manufacturers.


The last 24 bits are assigned by the manufacturer themselves, called the extension identifier. The same manufacturer of the network card MAC address after 24 is different.


The MAC address corresponds to the second layer data link layer of the OSI reference model. The switch at the data link layer maintains the computer MAC address and the database of its own port. The switch according to the "destination MAC address" field in the received data frame To forward data frames.


The first byte of the first 8Bit (00-50-BA -... in the corresponding 00000000-01010000-10111010 -..., bold font Bit) identifies whether this address is a multicast address or a unicast address The This is determined by the Ethernet transmission protocol high byte first pass, but within each byte of the low first pass the characteristics of the decision, see IEEE 802.3 3.2.3 Address fields: "The first bit (LSB) shall be used in the Destination Address field as an address type designation bit to identify the Destination Address either as an individual or as a group address. If this bit is 0, it shall indicate that the address field contains an individual address. If this bit is 1, it shall Indicate that the address field contains a group address that indicates none, one or more, or all of the stations connected to the LAN. In the Source Address field, the first bit is reserved and set to 0. " In fact, the order of this transmission is 000000000000101001011101 ... "The first bit (LSB)" is the preamble of the first 8Bit.


The physical address of the network card is usually burned by the card manufacturer's EPROM (a flash chip, usually through the program erase), it stores the data is really transmitted to identify the data sent to the computer and receive data host address.


In other words, in the physical layer of the underlying network transmission process, through the physical address to identify the host, it must be the world's only. For example, the famous Ethernet card, its physical address is 48bit (bit) of the integer, such as: 44-45-53-54-00-00, machine-readable way into the host interface. The Ethernet address management authority (IEEE) (IEEE: Institute of Electrical and Electronics Engineers) divides the Ethernet address, which is a different combination of 48 bits, into several independent continuous address groups that produce Ethernet network card manufacturers to buy one of them, the specific production, one by one will be the only address given to the Ethernet card.


Vaguely, MAC address is like our ID card on the identity card number, with global uniqueness.

★ MAC address application method

MAC address application required information
A. Applicant information - including name, position, company name, address and email address;
B. Company information, if not the first application, be sure to ensure that the existing MAC address utilization rate has reached 95%, otherwise not to apply, and re-apply for the reasons, but also need to provide the type of company, is the parent company or subsidiary, Or both;

MAC address application category
 
MAC cycle of the general customer service time to play, you need about 7 working days (bank transfer time)
A. MAC Address Block Large (MA-L)
Because a total of 12 hexadecimal code of the MAC address, vendor ID accounted for the first six (unique), the other six customers are free to use, self-management, application fee is US $ 2,735 +20 (bank transfer fee) = 2755 , So apply for a vendor ID number can enjoy 2 of the 24 power that is 16777216 MAC address, usually recorded as 16 million.
The application to the MAC can be found in the official website of the IEEE, if the manufacturer wants to keep the application information confidential, need to pay a security fee of $ 3,070 per year.
 
B. MAC Address Block Medium (MA-M)
This way will be allocated in front of the seven to the manufacturers (there will be a number of companies share), followed by five customers self-management, the cost is US $ 1645 +20 (bank transfer fee) = 1665, so apply a vendor ID number can enjoy 2 Of the 20 power side that is 1048576 MAC address, usually recorded as 1 million.
The application to the MAC can be found in the official website of the IEEE, if the manufacturer wants to keep the application information confidential, need to pay a security fee of $ 2,015 per year.
 
C. MAC Address Block Small (MA-S)
This way will be allocated in front of the 9 to the manufacturers (there will be a number of companies share), behind the three customers to manage their own, the cost is US $ 685 +20 (bank transfer fee) = 705, so apply a vendor ID number can enjoy 2 Of the 12th party that is 4096 MAC address.
The application to the MAC can be found in the official website of the IEEE, if the manufacturer wants to keep the application information confidential, need to pay a security fee of $ 1,080 per year.
 
Under what circumstances need to apply for MAC address? Under what circumstances can not apply?

There are many programs such as chips, such as TV with network function chip, STB with network function chip, mobile phone chip, Wifi, Bluetooth chip, USB-lan and other chip manufacturers are generally have to apply OUI, if you use their chips, Shipments are not very large circumstances, are able to find them to release some of the address section.
If a lot of shipments, such as large companies, they are to apply for MAC address, their own vendor's MAC address is convenient for production management and after-sales service.
Of course, using the chip vendor's address segment (or by other companies), you can also do a good job of production records to achieve effective management.

De Puhua testing center for wireless customers to provide MAC address applications, IMEI number of applications, professional 10 years of experience, successfully help many customers to apply for certification can be exempt from the application fee.

★ MAC address application certificate template:
 
If you have more questions about MAC address application, please consult our customer service consultant 15338845025.

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