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For IP addresses there are 10.x.x.x , 192.168.x.x IP address that can be used for private networks. Is there something similar for MAC address of network cards that can be safely used without applying for the permission from IEEE？
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Apple unveiled a "private address" feature in iOS 14 to enhance security. This feature tells the device to use a different, random MAC (media access control) address for each Wi-Fi network it connects to. By default, the private address feature is enabled on devices running iOS 14 or later.
Disclosing the MAC address in itself shouldn't be a problem. MAC addresses are already quite predictable, easily sniffable, and any form of authentication dependent on them is inherently weak and shouldn't be relied upon. MAC addresses are almost always only used "internally" (between you and your immediate gateway).
The process of masking a MAC address is known as MAC spoofing. Essentially, MAC spoofing entails changing a computer's identity, for any reason.
Yes, you can use a "Locally Administered Address" http://standards.ieee.org/regauth/groupmac/tutorial.html
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In addition to what @Tergiver correctly said, you need to be careful about the ordering in which the bits are sent (it may not be obvious). If my calculations are correct, this means that the MAC address (as normally written) must start with x2, x6, xA or xE (where x is in [0-F]).
(The ones I've been given my network administrator start with 0E:)
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