Mac addresses is made of only 12 digits containing 0-F. So, will they eventually run out of combinations, since each computer has a unique physical address?
2 Answers
There is some concern that MAC addresses may be exhausted in about 80 years. The IEEE EUI-64 standard prevents such an event, which extends the size of MAC addresses from 48 bits to 64. Alternatively, hardware vendors may be able to simply recycle old MAC addresses from long-gone devices (e.g., junk over ~20 years old).
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