An IPv4 address is 32 bits long (4 octets ): this means there are 4.3 billion addresses available which are going to be soon exhausted.
The first 3 binary octects are Network Id, while the last one is the Host ID
Different Computers on same Network will have same NetworkId, ( like 192.168.0) but have unique HostIDs.
What's an IP address?
IPv6 addresses are 128 bits long and use hexadecimal instead of dotted decimal.
When using IPv6 for VPC CIDR Block AWS will provide a /56 CIDR block from their own pool.
All IPv6 addresses are publicly routable and no NAT is necessary. If we want to allow only outbound traffic, we can use egress-only internet gateway.