CIDR First Ip- IpV4

while assigning CIDR block for subnets created for VPC (Aws cloud) the CIDR block 10.0.2.0/20 overlapping the CIDR block in of other subnet 10.0.0.0/24. As per my understanding the first ip of CIDR 10.0.2.0/20 will start with 10.0.2.0. So how it is overlapping. Thanks in advance!!!

1 answer

  • answered 2021-09-22 17:19 Mark B

    You aren't taking the different mask bits (20 vs 24) into account.

    CIDR Block 10.0.2.0/20 address range: 10.0.0.0 - 10.0.15.255

    CIDR Block 10.0.0.0/24 address range: 10.0.0.0 - 10.0.0.255

    I suggest using a tool like this to help visualize your CIDR blocks.

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