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. 1.1 New hardware for existing Internet Service Providers (ISP)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.