ENTERPRISE IPV4 & CIDR CALCULATOR

IPv4 CIDR Subnet Calculator

Calculate subnet masks, wildcard masks, usable host ranges, and binary network allocations for routing, firewall rules, and VPC architecture.

IPv4 Address

CIDR Prefix

Network Address

Broadcast Address

Subnet Mask

Wildcard Mask (Cisco/ACL)

Usable Host Range

Total Usable Hosts

32-Bit Binary Representation

IP Binary: -

Mask Binary: -

How CIDR (Classless Inter-Domain Routing) Works

CIDR was introduced in 1993 to replace the rigid Class A, B, and C address allocation system and slow the rapid exhaustion of IPv4 addresses. Instead of allocating rigid 8, 16, or 24-bit boundaries, CIDR allows variable length subnet masking (VLSM).

The slash notation (e.g., /24) denotes the number of leading bits dedicated to identifying the network, while the remaining bits ($32 - \text{prefix}$) identify individual host interfaces.