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CIDR Calculator

Start with a VPC block like 10.0.0.0/16 or 192.168.1.0/24

Block Info

Select a block to see details.

Subnet Tree

Visualize IP Subnets

Enter a CIDR block (e.g., 10.0.0.0/16) to visualize how it can be split into smaller subnets. This is essential for planning cloud networks (AWS VPC, Azure VNet).

Python (ipaddress module)
import ipaddress

net = ipaddress.ip_network('192.168.0.0/24')
for ip in net:
    print(ip)