CIDR Subnet Calculator

Compute network ranges, subnet masks, usable IP spans, and binary breakdowns for IPv4 subnets.

CIDR Block or IP Address

Netmask

255.255.255.0

Network Address

192.168.1.0

Broadcast Address

192.168.1.255

Usable Host Range

192.168.1.1 — 192.168.1.254

Usable Hosts

254

Total Addresses

256

Wildcard Mask

0.0.0.255

IP Classification

Private (RFC 1918)

About CIDR Subnet Calculator

Calculate subnet masks, network addresses, broadcast IPs, and usable host ranges from CIDR notation.

Calculates network address, broadcast address, and usable host range from any CIDR block.
Shows the subnet mask in both dotted-decimal and prefix-length form side by side.
Useful for planning VPC subnets or on-prem network segmentation.