My off-the-cuff answer is that the udpEndpointInstance exists in order to distinguish between multiple UDP Endpoints that are otherwise identical, so its specific value doesn't matter at all (otherwise than that it's unique, which is required by the fact that it's in the INDEX). One imagined implementation is to use the [low-order bits of] the address of the kernel data structure (e.g., see BSD's "netstat -A" output).
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