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MAC Address Tip Because MAC addresses are expressed in hexadecimal, only the numbers 0 through 9 and the letters A through F can be used in them. If you get a Network+ exam question about identifying a MAC address and some of the answers contain letters and numbers other than 0 through 9 and the letters A through F, you can discount those answers immediately. Apr 25, 2020 How you can identify MAC address and check MAC adress? Windows(XP,7,Vista,8): In the command prompt (CMD), type in getmac (or getmac /v /fo list for full info). Linux/Unix: type ifconfig -a. You must be root user or have appropriate permissions. Mac OS X: launch the Terminal and type ifconfig. Cisco: in the CLI type e.g. Every network-compatible device can be identified by its MAC (media access control) address, a unique 17-character string of letters, numbers and colons.
␡- Identifying MAC Addresses
Start typing in your model number (i.e. A1181), order number (i.e. MA255LL/A) or Apple serial number (i.e. W88010010P0) in the box above. Once the system detects what type of Apple device you have, it will add it to your device list below and give detailed specs as well as links to order specific parts for your particular device.
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This chapter is from the book Network+ Exam Prep 2 (Exam Prep N10-003)
This chapter is from the book
This chapter is from the book
Identifying MAC Addresses
Identify For Mac Keyboard
Objective:
2.1 Identify a MAC (Media Access Control) address and its parts.
This chapter many times refers to MAC addresses and how certain devices use them. However, it has not yet discussed why MAC addresses exist, how they are assigned, and what they consist of. Let’s do that now.
A MAC address is a 6-byte hexadecimal address that allows a NIC to be uniquely identified on the network. The MAC address forms the basis of network communication, regardless of the protocol used to achieve network connection. Because the MAC address is so fundamental to network communication, mechanisms are in place to ensure that there is no possibility of duplicate addresses being used.
To combat the possibility of duplicate MAC addresses being assigned, the Institute of Electrical and Electronics Engineers (IEEE) took over the assignment of MAC addresses. But rather than be burdened with assigning individual addresses, the IEEE instead decided to assign each manufacturer an ID and then let the manufacturer further allocate IDs. The result is that in a MAC address, the first three bytes define the manufacturer, and the last three are assigned by the manufacturer.
For example, consider the MAC address of the computer on which this book is being written: 00:D0:59:09:07:51. The first three bytes (00:D0:59) identify the manufacturer of the card; because only this manufacturer can use this address, it is known as the OrganizationalUniqueIdentifier(OUI). The last three bytes (09:07:51) are then referred to as the Universal LAN MAC address: They make this interface unique. You can find a complete listing of organizational MAC address assignments at http://standards.ieee.org/regauth/oui/oui.txt.
You can discover the MAC address of the NIC in various ways, depending on what system or platform you are working on. Table 3.4 defines various platforms and the method you can use to view the MAC address of an interface.
Table 3.4 Methods of Viewing the MAC Addresses of NICs
Platform | Method |
Windows 95/98/Me | Run the winipcfg utility |
Windows 2000/2003/XP | Run ipconfig /all from a command prompt |
Linux/some Unix | Run the ifconfig -a command |
Novell NetWare | Run the config command |
Cisco router | Run the sh int <interface name> command |
Identify Mac Address Vendor
Identify Macbook Air
Figure 3.28 shows the ipconfig /all command run on a Windows 2000 system. The MAC address is defined on the Physical Address line of the output.
Figure 3.28 The output from the ipconfig /all command on a Windows 2000 system.
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