Gavin Howe
Media Access Control (MAC) addresses are unique identifiers assigned to devices by their manufacturers. They are necessary for devices to connect to a network. MAC addresses can be used to track devices, but only if the device is connected to a Wi-Fi network and the tracker is in close physical proximity to the device. Law enforcement agencies can use MAC addresses to locate stolen devices and identify their owners, even if the serial number has been tampered with. However, MAC addresses are easy to spoof, and modern devices use random or rotating MAC addresses, making tracking through MAC addresses harder.
| Characteristics | Values |
|---|---|
| Can law enforcement use MAC address to find the owner? | MAC address identifies a device, but it does not leave the local network. Law enforcement may be able to get a warrant/tap to see the traffic between the device and the router, which will have the device's MAC address. However, MAC addresses are not carried beyond the local subnet boundary. |
| Tracking devices | It was possible to track devices by setting up WiFi hotspots and offering free WiFi, but now MAC addresses are randomized to prevent tracking. Modern mobile devices use random/rotating MAC addresses when scanning for WiFi networks, making tracking harder or impossible. |
| Work with cellular providers | Law enforcement can work with cellular providers to track the location of cellular devices using IMEI (International Mobile Equipment Identifier), which is similar to a MAC address. |
| Corporate monitoring | Corporate owners can place monitoring software on devices and have a full inventory of device identifiers. |
| Third-party data collection | Third-party marketing, financial, and security vendors collect large sets of data from various sources, including device identifiers. Law enforcement can obtain this data through routine requests, subpoenas, or warrants. |
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What You'll Learn
- MAC address tracking is possible if the device is connected to a WiFi network
- MAC addresses are unique to each device and assigned by the manufacturer
- Law enforcement can work with cellular providers to track the location of devices
- MAC addresses are not publicly routable like IP addresses
- MAC addresses can be used to identify stolen property
MAC address tracking is possible if the device is connected to a WiFi network
MAC (Media Access Control) addresses are unique identifiers tied to a device's physical network interface. They can be used to track a device's location, but only if the MAC address is not randomized and the device is connected to a WiFi network.
If a device is connected to a WiFi network, it is possible for an observer to view the device's MAC address if they are in close physical proximity to detect its radio signals (within the WiFi range). This is because the traffic between the device and the router will contain the device's MAC address, while the traffic between the router and the Internet Service Provider (ISP) will contain the router's MAC address as the source, not the device's.
There are several ways in which an ISP or other internet access provider can gain access to a device's MAC address. One common way is by providing free WiFi spots or guest networks. When a device connects to a WiFi network, it may be using its actual MAC address, which can then be observed by the ISP or network provider. Additionally, a device's MAC address may be linked to other identifying information, such as an IP address or IMEI number, which can be used to track the device's location.
In the case of law enforcement, it is possible for them to work with cellular providers to track the location of cellular devices using IMEI numbers, which are similar to MAC addresses in that they uniquely identify a device. However, it is unclear whether law enforcement can access this information without a warrant or other legal authorization.
To prevent MAC address tracking, it is recommended to randomize the MAC address, which is a feature available on many devices. This will limit the ability of observers to track the device's location, even if it is connected to a WiFi network.
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MAC addresses are unique to each device and assigned by the manufacturer
MAC addresses, or media access control addresses, are unique identifiers assigned to network interface controllers (NICs) for use as network addresses in communications within a network segment. Each MAC address is unique to a device, such as servers, computers, firewalls, switches, routers, and proxies, and is assigned by the manufacturer.
MAC addresses are typically represented by six groups of two hexadecimal digits, separated by hyphens, colons, or without a separator. The first half of the number is generally used as a manufacturer ID, while the second half is a device identifier. For example, MAC addresses are available from 00-00-00-00-00-00 through FF-FF-FF-FF-FF-FF.
The Organizationally Unique Identifier (OUI) is a critical component of the MAC address. The OUI must be unique between organizations (companies) and is controlled by the IEEE. The first 24 bits of the assigned MAC address block are an OUI assigned to the IEEE and will not be reassigned. The OUI is also present in the first three octets of a universally administered address, which is a unique address assigned to a device by its manufacturer.
It is worth noting that MAC addresses are primarily used for local identification, as they only operate within a local network environment and are not transmitted over the internet. Additionally, MAC addresses can be altered or spoofed using command-line tools and software settings. In the context of law enforcement, while a MAC address can identify a device, it does not leave the local network. The traffic between a device and a router will have the device's MAC address, but the traffic between the router and the ISP will have the router's MAC address as the source, not the device's.
Therefore, while MAC addresses are unique to each device and can be used to identify a specific device, the ability of law enforcement to use MAC addresses to find the owner of a device may be limited due to the local nature of MAC addresses and the potential for address randomization or alteration.
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Law enforcement can work with cellular providers to track the location of devices
Law enforcement agencies can work with cellular providers to track the location of devices. Cellular phones have an IMEI (International Mobile Equipment Identity) number, which is used to uniquely identify a device. The cellular provider can use this to identify which cell tower the device was connected to at any given time, providing a general location of the device.
In the United States, the law typically requires police to obtain a warrant to gather historical cellphone location information from cellular and wireless network providers. This was established by the U.S. Supreme Court in 2018 in the case of Carpenter v. United States. However, this ruling addressed technology from 2011, and the law is still catching up with newer forms of tracking technology. For example, police have been using "Fog Reveal" to access detailed location information from billions of mobile devices, sometimes without search warrants. This tool, provided by Fog Data Science LLC, allows police to create location analyses known as "patterns of life." While Fog maintains that signals cannot be linked back to specific devices or owners, law enforcement can use the data as a clue to find identifying information.
Additionally, law enforcement can use tower dumps and geofence searches to identify and track suspects. A tower dump refers to requesting CSLI (Call Session Records, or Location Information) data connected to certain cell towers at a specific time, while a geofence search identifies all users within a certain location at a certain time using location tracking applications. These methods allow police to work backward to identify a suspect by narrowing their search parameters.
It is worth noting that the MAC address of a device is usually limited to a local network environment and does not leave the local network. However, if the device is actively connected to a WiFi network, an observer in close proximity may be able to see its MAC address.
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MAC addresses are not publicly routable like IP addresses
On the other hand, IP, or Internet Protocol, addresses are globally unique identifiers that are explicitly designed to be public and unattached to a specific network. IP addresses allow for inter-networking, enabling communication between devices on different networks. This makes IP addresses publicly routable, allowing data to be transmitted between different networks and devices.
The key difference between MAC and IP addresses lies in their scope and purpose. MAC addresses are intended for local network communication and are tied to a specific device within that network. They serve as a physical identifier for a device, much like a house's physical description. However, MAC addresses are not used for routing data over the internet.
In contrast, IP addresses provide a logical address that enables data routing between different networks. An IP address is like a postal address, allowing data to be routed to the correct destination, regardless of the underlying network infrastructure. This global routability of IP addresses is essential for the functioning of the internet as we know it today, facilitating communication between devices across different networks and manufacturers.
The use of IP addresses also offers advantages in terms of bandwidth and resource efficiency. By summarizing routes to multiple devices within a network, IP addresses help optimize data transmission, making networking more efficient and streamlined. Additionally, IP addresses provide a standard platform for network devices, enabling communication between devices from different manufacturers.
In summary, MAC addresses are not publicly routable like IP addresses due to their limited scope and local network usage. MAC addresses are designed for device identification within a single network, while IP addresses enable global communication and data routing across different networks, making them publicly accessible and routable.
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MAC addresses can be used to identify stolen property
If you have connected your device to a Wi-Fi access point, you may be able to find its MAC address in the logs or DHCP lease table accessible through the access point's configuration website. The MAC address may also be found in your router or another router you connected to with your device. Additionally, if you have documentation or a retail box for your device, the MAC address may be listed there.
In the case of a stolen laptop, if you can show that you owned a laptop with a particular MAC address, and a laptop is found with a matching address, it can be identified as yours. However, MAC spoofing is relatively easy, and investigators are aware of this. Therefore, it is not a foolproof method of identifying stolen property.
Law enforcement agencies may be able to work with cellular providers to track the location of devices using IMEI (International Mobile Equipment Identity), which is similar to a MAC address. However, this method only provides a general location, usually within several miles. Additionally, corrupt law enforcement officers may be able to obtain device information by making routine law enforcement requests, subpoenas, or warrants to tech companies.
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Frequently asked questions
MAC addresses are unique to each device and are required for wifi-enabled devices to connect to a network. Law enforcement can use a MAC address to find the owner of a device, but only if the device is connected to a wifi network and they are in close physical proximity to the device.
Law enforcement can retrieve the MAC address of a device from the log history of any wifi router the device has accessed. This can include routers at the owner's home, work, or friend's place.
If the device is not connected to a wifi network, its MAC address will be randomized to limit tracking. In this case, law enforcement would not be able to use a MAC address to find the owner of the device.
Yes, law enforcement can work with cellular providers to track the location of mobile devices using their IMEI (International Mobile Equipment Identifier). This can identify the general location of a device, usually within several miles.
MAC addresses are unique but easier to spoof than an IP address. Additionally, MAC addresses are not publicly routable like IP addresses, and they do not leave the local network.
