TCP/IP computer networks use both the IP addresses and MAC addresses of connected client devices. While the IP address changes over time, the MAC address of a network adapter always stays the same.
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There are several reasons you might want to know the MAC address of a remote computer, and it's easy to do by using a command line utility such as Command Prompt in Windows.
A single device can possess multiple network interfaces and MAC addresses. A laptop computer with Ethernet, Wi-Fi, and Bluetooth connections, for example, has two or sometimes three MAC addresses associated with it, one for each physical network device.
Why to Figure Out a MAC Address?
Reasons to track down the MAC address of a network device include:
- To set up MAC address filtering on a router to restrict local network access to only those devices whose addresses match a list of presets.
- To determine the device's manufacturer (first half of the address) and serial number (second half of the address) for service.
- To masquerade (spoof) the identity of a different device. MAC addressing spoofing can be used legitimately to register a home network gateway device with an internet provider. It can also have malicious intent, such as to defeat the MAC address filtering feature to break into the network.
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.
A computer's hardware configuration determines its MAC address, while the configuration of the network it is connected to determines its IP address.
However, if the computers are connected to the same TCP/IP network, you can determine the MAC address through a technology called ARP (Address Resolution Protocol), which is included with TCP/IP.
Using ARP, each local network interface tracks both the IP address and MAC address for each device it has recently communicated with. Most computers let you see this list of addresses that ARP has collected. Mac os manual backup.
How to Use ARP to Find a MAC Address
In Windows, Linux, and other operating systems, the command line utility arp shows local MAC address information stored in the ARP cache. However, it only works within the small group of computers on a local area network (LAN), not across the internet.
There's another method used to find the MAC address of the computer you're currently using, which involves using the ipconfig /all command in Windows.
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ARP is intended to be used by system administrators and is not a typically useful way to track down computers and people on the internet.
Here is one example of how to find a MAC address via an IP address. Start by pinging the device you want the MAC to address for:
You will want to use a local address, so if your network is 10.0.1.x, then use that number to ping, as in the image below.
The ping command establishes a connection with the other device on the network and should show a result like this:
Use the following arp command to get a list that shows the MAC address of the device you just pinged:
The results may look something like this but probably with many other entries:
Find the device's IP address in the list; the MAC address is shown right next to it. In this example, the IP address is 192.168.86.45 and its MAC address is 98-90-96-B9-9D-61 (they're in bold here only for emphasis).
Check Your Router's Connection Data
To find the MAC address of the device connected to your router, assuming you can access the router's administrative control panel, log in and check for connected devices. Each active device, as well as recently connected devices, should list the local IP address as well as the MAC address.
When organizing your home or small office network sometimes it can be easier to assign each computer it’s own IP address rather than using DHCP. Today we take a look at how to do it in OS X.
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Previously we showed you how to set a Static IP in Windows, and you have a Mac machine on your network, you might want to assign it a Static IP as well.
Set Static IP in OS X
You will need to open System Preferences, once there open Network
It would be a good idea to to edit the Locations so that you can easily change from DHCP to manual IP simply. You will need to go to Edit Locations… with in the Network Preference Pane
Name it something that will let you remember what it is for.
Once you have named the new location you will click on the connection you want to set manually. In this example we will use Ethernet. From the Configure IPv4 drop down we will choose Manually.
Now we will add the IP Address, Subnet Mask, Router, DNS and Search Domains. In this example we will use Google’s DNS which is 8.8.8.8 and your Search Domain will depend on your network.
Checking Ip Address On Mac
This is a handy little option to use if you are setting up your own small network for home office or even LAN parties. It can be helpful when troubleshooting networks as well.
Find Ip Using Mac Address
Another OS X networking article you might be interested in is how to mount a Windows share in OS X.
How To Find Static Ip Mac
READ NEXTIp Mac Address
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