What happens if I change my Mac address on my PC?

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OM2

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Does it do anything to anything...?
Like software installed or something?

Thanks.
 

DaveA

David
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Why would you want to do this?

From https://whatismyipaddress.com/change-mac
Although physical MAC (Media Access Control) addresses are permanent by design, several mechanisms allow modification, or "spoofing", of the MAC address that is reported by the operating system. This can be useful for privacy reasons, for instance when connecting to a Wi-Fi hotspot, or to ensure interoperability. Some internet service providers bind their service to a specific MAC address; if the user then changes their network card or intends to install a router, the service won't work anymore. Changing the MAC address of the new interface will solve the problem. Similarly, some software licenses are bound to a specific MAC address. Changing the MAC address in this way is not permanent: after a reboot, it will revert to the MAC address physically stored in the card. A MAC address is 48 bits in length.

As a MAC address can be changed, it can be unwise to rely on this as a single method of authentication. IEEE 802.1x is an emerging standard better suited to authenticating devices at a low level.
 
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To add to this, changing your MAC address can cause problems, depending on what environment the machine is in. In business or tech environments (which often use wireless access points (WAPs), wired switches in a private network, or network rules that only allow traffic to known MAC addresses), this could kick you out of the network, lose internet access, and generally be dead in the water. Private use PC is not so dire.
 
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