It's possible that you don't look at the Finder on your Mac from one end of the working day to the other. If you live in Microsoft Excel, for instance, then you can be opening and closing. If your MP3 files are named with tags in the file name like band-album-track-title.mp3, you can tell Mp3Tag to convert the naming convention of your files into the actual tags.
Since uniqueness is all you should care about (beyond making the address well-formed), I'd worry about the MSBs in the OUI and use a sequence in the NIC specific bytes. The distribution of the addresses is likely unimportant to your application (even though some NIC or switch implementations might use them as an input to a hash, this is likely not to be a big concern). You may want to consider using the 'locally administered' to avoid a conflict with an existing device manufacturer.
Avoid pitfalls like setting the multicast bit (your example does). To avoid duplicates: If you're going to generate a LOT (millions) of such MAC addresses, you might want to generate an in-order list of MAC's, feed that to a linear randomization process (GNU sort -R should do fine - I don't think it does this in linear time, but it has a similar end result) once, and then pull your fresh addresses off one end of the randomized list as needed. I believe such a list should fit in about 34 megabytes. If you merely need thousands, you're probably better off maintaining a text file with already-selected values, and checking for collisions against that, adding new values as you go. This is a slower algorithm asympotically speaking, but it has a much less overhead, so it should still be a win for lower numbers of mac addresses. BTW, should the 4th octet (numbered from 1 starting on the left), be 0-ff instead of 0-7f? I see no occurrences of 7f or 127 in the Wikipedia page on Mac addresses.
For anyone wanting to generate their own MAC addresses (a good example is for VM NICs), you probably just want this: '02:00:00:%02x:%02x:%02x'% (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)) Or, if you want to do this in a unix'y shell, this works on many: printf '02:00:00:%02X:%02X:%02X n' $((RANDOM%256)) $((RANDOM%256)) $((RANDOM%256)) This gives you a unicast MAC address that is 100% safe to use in your environment, and isn't trampling on anyone's registered MAC address space. The bottom two bits of the top byte (0x02) give you a locally administered unicast address, which is probably what you want if you are hitting stackoverflow for how to generate this.:) If the MAC address is not locally administered, it means it is supposed to be 'globally unique'. MAC addresses in this category are centrally registered with the IEEE, and you should have a unique OUI (Organizationally Unique Identifier) issued to you by the IEEE. See link for the global registry of OUI values.
This OUI value ends up in the first 3 bytes (or just the top 22 bits, really). MAC addresses aren't that complicated, so you should probably also just have a look at the definition. Wikipedia has.
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