Spamming engines using IPv4 addresses frequently cycle through IP addresses in order to defeat rate limiting filters. These are all generally within the same /24 block. What's the equivalent invariant network part generally seen in IPv6 addressed spam? Generally address providers will give out a /64 or even a /48 for the asking. We don't publish any MX's tied to AAAA records so we don't see any IPv6 spam, but I assume it exists.
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