Amazon EC2 and Amazon VPC support both the IPv4 and IPv6 addressing protocols. By default, Amazon VPC uses the IPv4 addressing protocol; you can't disable this behavior. When you create a VPC, you must specify an IPv4 CIDR block (a range of private IPv4 addresses). You can optionally assign an IPv6 CIDR block to your VPC and assign IPv6 addresses from that block to instances in your subnets.
Private IPv4 addresses
A private IPv4 address is an IP address that's not reachable over the Internet. You can use private IPv4 addresses for communication between instances in the same VPC.
Public IPv4 addresses
A public IP address is an IPv4 address that's reachable from the Internet. You can use public addresses for communication between your instances and the Internet. When you launch an instance in a default VPC, we assign it a public IP address by default.
Elastic IP addresses (IPv4)
An Elastic IP address is a public IPv4 address that you can allocate to your account. You can associate it to and disassociate it from instances as you require. It's allocated to your account until you choose to release it.
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Негізгі бет AWS - Public vs Private IP & Elastic IP
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