Designing AWS Environments by Mitesh Soni

Author:Mitesh Soni
Language: eng
Format: epub
Tags: COM048000 - COMPUTERS / Systems Architecture / Distributed Systems and Computing, COM051440 - COMPUTERS / Software Development and Engineering / Tools, COM091000 - COMPUTERS / Cloud Computing
Publisher: Packt Publishing
Published: 2018-09-29T11:37:31+00:00

Here is a link to one of the many online calculators that will convert CIDR notation to starting and ending IP addresses: http://www.ipaddressguide.com/cidr.

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 in your VPC, five addresses are reserved by AWS. These are the first four and last one in the subnet block. So, that leaves only 11 IP addresses for your /28 VPC:

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