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#Free smac mac address changer zip file
#Free smac mac address changer drivers
#Free smac mac address changer windows 7
#Free smac mac address changer windows

The assignment of OUIs is usually public and can be determined via databases.

Bit 3–24 (manufacturer identification): Bits 3 to 24 encode an identifier (organizationally unique identifier, OUI), which is assigned exclusively to hardware manufacturers by IEEE.

Addresses that are only locally unique are called locally administered address (LAA) and are marked with U/L = 1. If U/L = 0, the address is valid worldwide as a universally administered address (UAA).

Bit 2 (registry): The second bit of the MAC address indicates whether it is an address with global validity (universal) or whether the address has been assigned locally (local).

Multicast addresses are identified by I/G = 1 and are addressed to several receivers. If I/G = 0, it is a unicast address for a single network adapter. This bit is called I/G (short for individual/group).

Bit 1 (receiver): The first bit of the MAC address specifies whether it is an individual or group address.

There are many utilities for changing MAC addresses on Windows, but some are graphical-only and some are not open source or in the public domain.The bit sequence of each MAC address is divided into 4 areas, each of which encodes different information. Changing one's MAC address is also useful for a variety of security purposes (some good, some bad) such as in penetration testing. While IP addresses change frequently, MAC addresses generally do not, hence, unchanging MAC addresses are a privacy risk because they can be used for device tracking over long periods of time.

#Free smac mac address changer drivers

Some 802.11 wireless NIC drivers will not accept a customized MAC address unless the " locally administered" bit is set in the first octet of the MAC address (this is what the -wireless switch does in the script). Your MAC address(es) will look similar to "00-0D-28-3F-2B-54" because they are formatted in hexadecimal. To see your current MAC address(es), open CMD or PowerShell, run "ipconfig.exe /all" and look for the "Physical Address" line(s). With IPv4, a host can discover the MAC of another network-attached device using the Address Resolution Protocol ( ARP) or, with IPv6, with ICMP Neighbor Discovery Protocol ( NDP).

#Free smac mac address changer windows

The Media Access Control ( MAC) address is a 48-bit number built into a Network Interface Card (NIC) by the manufacturer, though the MAC address can usually be changed or "spoofed" on Windows by modifying a registry value named " NetworkAddress" in a key associated with that particular NIC. Note: If you examine the source code, you'll find a few other options for the random-mac() function to play with. To modify the registry, but not disable and enable the NIC, and not release or renew any DHCP leases: new-macaddress.ps1 -donotresetinterface To delete the registry value for the custom MAC address so that the built-in MAC of the NIC will be used instead (revert to factory default): new-macaddress.ps1 -resetdefault To select a random MAC address with a valid vendor ID number, and either assign the MAC to the sole physical interface, or, if there are multiple interfaces, prompt the user to select the desired interface: new-macaddress.ps1 You must be a member of the local Administrators group. The New-MACaddress.ps1 script requires PowerShell 2.0 or later. If this is the case for your particular NIC, use the -Wireless switch to set that special bit. Note that many interfaces, such as for your particular 802.11 wireless card, will not accept a custom MAC address unless a special bit in the MAC indicates that it has been customized.By default, the script changes the MAC, releases the DHCP lease for that one NIC, disables the NIC, enables the NIC, and then renews its DHCP lease again if you don't want this behavior, use the -DoNotResetInterface switch, but note that the new MAC address will not become effective until after the NIC is reset.The MAC will be random, except that it will have a valid manufacturer identifier from a common vendor like Intel, Apple or Netgear.If you have multiple NICs, the script will ask you which to modify, or you can pass in the NIC number as an argument.Set the appropriate Windows registry value to override the default MAC address for a NIC.

#Free smac mac address changer zip file

Download the SEC505 zip file from and look in the \ Day4\Wireless folder for the script named "New-MACaddress.ps1" (all the scripts in the zip file are free and in the public domain). You can get a simple PowerShell script for changing MAC addresses from the command line.

#Free smac mac address changer windows 7

On Windows 7 and later, the MAC address for 802.11 wireless interfaces must sometimes be specially crafted in order for the operating system to accept it. Changing the hardware MAC address on network interface cards is useful for maintaining privacy and security testing.