Security Group CIDR Examples

When adding a new rule to a Security Group, you can also specify CIDR configurations for each rule. Some examples are provided below.

• 0.0.0.0/0 – This CIDR configuration leaves traffic open to the world. However, other firewalls between the CIDR and the remote machine can still block traffic.
• 216.37.64.68/32 – This CIDR configuration only allows 216.37.64.68 access to the selected port(s). The /32 is used to specify traffic for only the preceding IP address.
• 192.168.1.0/24 – This CIDR configuration allows all IPs between 192.168.1.1 and 192.168.1.254 access to the selected port(s). The /24 is used to specify this traffic range.