title: Why specify cidr range in Inbound IP address for aws security groups
body: <p>For example, in AWS security groups, we speicfy a IP address that can login, but then we put /24 or /32 for IPv6</p>
  
  <p>Is that the only reason for specifying the cidr range, or can we do more configuration? </p>
  
  <p>e.g. From source: 32.232.232.11/24. why have the 24 in there? </p>