IP Addresses in AWS

• IPv4 – Internet Protocol version 4 (4.3 Billion Addresses)

• Public IPv4 – can be used on the Internet

• EC2 instance gets a new a public IP address every time you stop then start it (default)

• Private IPv4 – can be used on private networks (LAN) such as internal AWS networking (e.g., 192.168.1.1)

• Private IPv4 is fixed for EC2 Instances even if you start/stop them • Elastic IP – allows you to attach a fixed public IPv4 address to EC2 instance

  • Note: has ongoing cost if not attached to EC2 instance or if the EC2 instance is stopped

  • IPv6 – Internet Protocol version 6 (3.4 × 10!" Addresses)

• Every IP address is public (no private range)

• Example:2001:db8:3333:4444:cccc:dddd:eeee:ffff