Most Snowplow customers have an AWS VPC IP range set to 10.100.0.0/16. This covers 10.100.0.0 to 10.100.255.255, making available a significant number of IP addresses.
As EKS is IP intensive with each pod requiring a dedicated IP, we have started using an additional range which is by default set to 100.64.0.0/16 to avoid exhaustion.
It represents a range of IP addresses starting from 100.64.0.0 up to 100.64.255.255, giving an extra 65,536 possible addresses. This range falls within the larger 100.64.0.0/10 block, which is reserved for Carrier-Grade NAT (CGNAT) as per RFC 6598.