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And you have that 16-bit, randomly-chosen ID number… hopefully your server chooses randomly, and doesn’t use a guessable sequence. So you have 31 bits of randomness. And although 2 31 [just over 2 billion] is a lot of different requests that you’d have to send, it’s by no means out of the ordinary these days. Even on my ancient laptop, Doug, sending 2 16 [65,536] different UDP requests to a DNS server takes an almost immeasurably short period of time.