VPC IP Addresses

• IP addresses enable resources in your VPC to communicate with each other, and with resources over the Internet.

• EC2 and VPC support IPv4 and IPv6.

• By default, EC2 and VPC use the IPv4.

• When you create a VPC, you must assign it an IPv4 CIDR block (a range of private IPv4 addresses).

• Private IPv4 addresses are not reachable over the Internet.

  • To connect to your instance over the Internet, you can assign a globally-unique public IPv4 address to your instance.

• All subnets have a modifiable attribute that determines whether a network interface created in that subnet is assigned a public IPv4 address and, if applicable, an IPv6 address.