this post was submitted on 07 Jul 2025
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So, I get that 256 is a base 2 number. But we're not running 8-bit servers or whatever here (and yes, I understand that's not what 8-bit generally refers to). Is there some kind of technical limitation I'm not thinking of where 257 would be any more difficult to implement, or really is it just that 256 has a special place in someone's heart because it's a base 2 number?
Because 256 is exactly one byte. If you want to add a 257th member, you need a whole second byte just for that one person. That's a waste of memory, unless you want to go to the 64k barrier of users per chat.
Except that they're almost certainly just using
int, which is almost certainly at least 32 bits.256 is chosen because the people writing the code are programmers. And just like regular people like multiples of 10, programmers like powers of 2. They feel like nice round numbers.
It'll have to do with packet headers, 8 bits is a lot for an instant message packet header.