#cidr
Reading and sizing CIDR blocks — masks, host ranges, and the AWS-specific arithmetic that makes a /24 give you 251 usable addresses rather than 254.
2 articles tagged #cidr, newest first.
100.64.0.0/10 in AWS: Using CGNAT Space to Fix EKS IP Exhaustion
When an EKS cluster runs out of pod IPs and the VPC has no RFC 1918 space left, a 100.64.0.0/10 secondary CIDR is the fix. Why AWS allows it, and what breaks.
Why AWS Reserves 5 IP Addresses in Every Subnet (and What Each One Does)
AWS takes five addresses out of every VPC subnet: network, router, DNS resolver, one in reserve, and broadcast. What each is for, and how it changes sizing.