Limitations of MAC Address Lookups. It isn't usually possible to look up MAC addresses for devices that are outside a person's physical reach. It often isn't possible to determine the MAC address of a computer from its IP address alone because these two addresses originate from different sources. Sep 17, 2019 Some routers will let you enter devices and MAC addresses manually. But to do this, you'll need to know the MAC address of the computer you're connecting. How To Identify The Mac Address Of Your Computer. Checking the Mac address on a Windows system is very easy. Open the Windows Command window, type ipconfig /all and press Enter. Basic misunderstanding in the question. When you connect to a WiFi access point (AP), you do a handshake without an IP address. Most APs will then provide an IP address after the initial security / connection handshake when the device asks for one. Finding the media access control (MAC) address, or hardware address, for the hosts on your network is a fairly simple process. It involves the use of the address resolution protocol (ARP), which converts Internet protocol (IP) addresses into the MAC address.
Update The default WPA2-PSK passphrase used in some Belkin routers simply replaces a character of the device's MAC address with another hecxadecimal character, according to security blogger Jakob Lell.
Lell describes the situation as follows:
Each of the eight characters of the default passphrase are created by substituting a corresponding hex-digit of the WAN MAC address using a static substitution table. Since the WAN MAC address is the WLAN MAC address + one or two (depending on the model), a wireless attacker can easily guess the wan mac address of the device and thus calculate the default WPA2 passphrase.
In either case, that's problematic because it is possible to interrogate WiFi routers in order to learn their MAC address. Some models even advertise the address on the case of the device!
Lell's revelation, which he says makes it possible to deduce passwords by drawing up a simple substitution table, means all an attacker needs to do to compromise a device is learn its MAC address and then spend a few minutes converting it into Hex.
Lell's post on the topic suggests Belkin's Surf N150 Model F7D1301v1, N900 Model F9K1104v1 and N450 Model F9K1105V2 are all susceptible to the attack.
He also writes that other routers may have the same issue, with only the substitution table differing.
'It is likely that other Belkin devices are affected as well,' Lell's post says, adding that he has tried to engage the company on the issue since January 2012, without success. 'Unfortunately, Belkin has not yet cooperated with us to fix the vulnerability and/or confirm a list of other affected devices,' he says.
The good news is that users need only change the password to make the poorly-coded default codes irrelevant. And we all know users are always diligent about that kind of chore and would never leave a system in an insecure state.
Belkin has responded to The Register's inquiries, saying 'We have been made aware of the work recently published by two researchers at the Technische Universität Berlin regarding the default security configuration of Belkin routers, and appreciate their contribution to improved Wi-Fi security.'
The responses goes on to say the company is 'reviewing the details of the published research to understand its full implications' and will fix the problem if necessary, 'so as to ensure our users continue to benefit from the maximum level of security possible while also guaranteeing interoperability and ease of use.' ®
How To Know Passphrase For Mac Address Free
We can find mac address (physical address) of a computer using the command ‘getmac‘. This can be used to get mac address for remote computers also. Below are few examples on how to use this command. It works on XP, Vista, Windows 7, Server 2003 and Server 2008 operating systems.
Get mac addresses from CMD
Just run the command getmac to get the mac addresses. Find an example below.
This command does not show mac addresses for the network connections which are disabled. You can run ncpa.cpl and check which NICs are disabled. Further, I have received comments that this command does not help identify the mac address for a specific device. For example, if I need to get the mac address for my WiFi card, output of getmac command is not helpful. We can use ipconfig command to deal with this.
Get mac address of a remote computer
We can retrieve the mac addressses for a remote computer using nbtstat command.
Example:
Alternatively, We can run the below command to retrieve the mac addresses of a remote computer.
remote_computer : Full name of the remote computer or IP address
username and password are of the account on the remote computer.
Example:
How To Know Passphrase For Mac Address 2016
If you do not want to specify the password, you can skip /p parameter. You will be prompted to enter the password and the command execution will take place after that.
Errors:
Lell describes the situation as follows:
Each of the eight characters of the default passphrase are created by substituting a corresponding hex-digit of the WAN MAC address using a static substitution table. Since the WAN MAC address is the WLAN MAC address + one or two (depending on the model), a wireless attacker can easily guess the wan mac address of the device and thus calculate the default WPA2 passphrase.
In either case, that's problematic because it is possible to interrogate WiFi routers in order to learn their MAC address. Some models even advertise the address on the case of the device!
Lell's revelation, which he says makes it possible to deduce passwords by drawing up a simple substitution table, means all an attacker needs to do to compromise a device is learn its MAC address and then spend a few minutes converting it into Hex.
Lell's post on the topic suggests Belkin's Surf N150 Model F7D1301v1, N900 Model F9K1104v1 and N450 Model F9K1105V2 are all susceptible to the attack.
He also writes that other routers may have the same issue, with only the substitution table differing.
'It is likely that other Belkin devices are affected as well,' Lell's post says, adding that he has tried to engage the company on the issue since January 2012, without success. 'Unfortunately, Belkin has not yet cooperated with us to fix the vulnerability and/or confirm a list of other affected devices,' he says.
The good news is that users need only change the password to make the poorly-coded default codes irrelevant. And we all know users are always diligent about that kind of chore and would never leave a system in an insecure state.
Belkin has responded to The Register's inquiries, saying 'We have been made aware of the work recently published by two researchers at the Technische Universität Berlin regarding the default security configuration of Belkin routers, and appreciate their contribution to improved Wi-Fi security.'
The responses goes on to say the company is 'reviewing the details of the published research to understand its full implications' and will fix the problem if necessary, 'so as to ensure our users continue to benefit from the maximum level of security possible while also guaranteeing interoperability and ease of use.' ®
How To Know Passphrase For Mac Address Free
We can find mac address (physical address) of a computer using the command ‘getmac‘. This can be used to get mac address for remote computers also. Below are few examples on how to use this command. It works on XP, Vista, Windows 7, Server 2003 and Server 2008 operating systems.
Get mac addresses from CMD
Just run the command getmac to get the mac addresses. Find an example below.
This command does not show mac addresses for the network connections which are disabled. You can run ncpa.cpl and check which NICs are disabled. Further, I have received comments that this command does not help identify the mac address for a specific device. For example, if I need to get the mac address for my WiFi card, output of getmac command is not helpful. We can use ipconfig command to deal with this.
Get mac address of a remote computer
We can retrieve the mac addressses for a remote computer using nbtstat command.
Example:
Alternatively, We can run the below command to retrieve the mac addresses of a remote computer.
remote_computer : Full name of the remote computer or IP address
username and password are of the account on the remote computer.
Example:
How To Know Passphrase For Mac Address 2016
If you do not want to specify the password, you can skip /p parameter. You will be prompted to enter the password and the command execution will take place after that.
Errors:
Using getmac command we can retrieve the mac addresses of the machines running windows OS only. If you try this for a Linux machine you would get the error 'The RPC server is unavailable.'
If you provide incorrect password, the command would fail with the error message 'Logon failure: unknown user name or bad password.'
Also Read:
Windows CMD commands reference