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Limiting each IPv4 address to one message every 10 seconds will limit the total usage of the service to 370 000 000 messages per second on average. Any further guarantees will be entirely dependent on the providers. Many providers are deploying carrier grade NAT, so there could be thousands of users behind a single public IPv4 address. On the other hand, ...


To avoid IPs exhaustion, among other things, ISPs generally use private IP addresses and NAT them through a pool of public IP addresses. So it does not make sense to rate limit per (public) IP.

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