Subnet / CIDR Calculator

Visualize, calculate, and learn how IP subnetting works.

CIDR stands for Classless Inter-Domain Routing — a method for allocating IP addresses more efficiently than the old class-based system.

{{ label_prefix }}: /{{ prefix }}

0 {{ label_network_bits }} ({{ prefix }})

0 {{ label_host_bits }} ({{ 32 - prefix }})

{{ label_network_address }} {{ hints.network_address }}	`{{ result.network_address }}`
{{ label_broadcast_address }} {{ hints.broadcast_address }}	`{{ result.broadcast_address }}`
{{ label_subnet_mask }} {{ hints.subnet_mask }}	`{{ result.subnet_mask }}`
{{ label_wildcard_mask }} {{ hints.wildcard_mask }}	`{{ result.wildcard_mask }}`
{{ label_total_hosts }} {{ hints.total_hosts }}	`{{ result.total_hosts }}`
{{ label_usable_hosts }} {{ hints.usable_hosts }}	`{{ result.usable_hosts }}`
{{ label_first_usable }} {{ hints.first_usable }}	`{{ result.first_usable }}`
{{ label_last_usable }} {{ hints.last_usable }}	`{{ result.last_usable }}`
{{ label_ip_class }} {{ hints.ip_class }}	`{{ result.ip_class }}`

#	{{ label_network_address }}	{{ label_subnet_range }}	{{ label_broadcast_address }}	{{ label_usable_hosts }}
{{ idx + 1 }}	`{{ sub.network }}`	`{{ sub.first }} – {{ sub.last }}`	`{{ sub.broadcast }}`	{{ sub.usable }}