Cloud Networking

CIDR Subnet Calculator

Interactive network subnetting playground. Input an IP address and adjust the CIDR block mask to calculate host space ranges and network boundaries.

Subnet Variables

Configure your network starting point and mask size.

Base IP Address Standard IPv4 address format (dotted decimal notation).

CIDR Mask Size /24

Select the prefix length (bits set to 1 in the mask).

Network Mask 255.255.255.0 11111111.11111111.11111111.00000000

Total Usable Hosts 254 Excludes network & broadcast IPs

Network Address -

Broadcast Address -

First Usable IP -

Last Usable IP -

Demonstrating how a parent VPC block partitions into smaller private and public subnets.