While this is generally a legitimate case, MAC spoofing of new devices can be considered illegal if the ISP's user agreement prevents the user from connecting more than one device to their service. In this case, the client spoofs their MAC address to gain Internet access from multiple devices. This can be circumvented easily by MAC spoofing, with the client only needing to spoof the new device's MAC address so it appears to be the MAC address that was registered by the ISP. Since MAC addresses are unique and hard-coded on network interface controller (NIC) cards, when the client wants to connect a new device or change an existing one, the ISP will detect different MAC addresses and might not grant Internet access to those new devices.

Many ISPs register the client's MAC address for service and billing services. New hardware for existing Internet Service Providers (ISP) MAC spoofing is done for legitimate and illicit purposes alike. However, MAC spoofing does not work when trying to bypass parental controls if automatic MAC filtering is turned on. It may also allow the user to bypass MAC address blacklisting to regain access to a Wi-Fi network. Motivation Ĭhanging the assigned MAC address may allow the user to bypass access control lists on servers or routers, either hiding a computer on a network or allowing it to impersonate another network device. Essentially, MAC spoofing entails changing a computer's identity, for any reason. The process of masking a MAC address is known as MAC spoofing. Additionally, there are tools which can make an operating system believe that the NIC has the MAC address of a user's choosing.

However, many drivers allow the MAC address to be changed. The MAC address that is hard-coded on a network interface controller (NIC) cannot be changed. MAC spoofing is a technique for changing a factory-assigned Media Access Control (MAC) address of a network interface on a networked device. JSTOR ( June 2022) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

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