September 2018
Beginner to intermediate
174 pages
3h 27m
English
Content preview from Designing AWS Environments
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Valid private IP address ranges
For VPCs, we need to specify private IP address blocks. The Internet Assigned Numbers Authority (IANA) has reserved certain IP address ranges to be used for private IPs.
The following are few examples:
So, the CIDR blocks for your VPCs need to fit into these ranges.
You can find some of them defined by RFC1918, as follows:
https://tools.ietf.org/html/rfc1918
On AWS, VPCs can be made as small as /28, which is 16 addresses, all the way up to /16, which is 65536 addresses.
However, think twice before you create a VPC as small as /28. You will have to create at least one subnet in your VPC, and for every subnet ...
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