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Subnet Mask Calculator

Calculate network subnets, IP ranges, and CIDR notation for network engineering.

IP Address

CIDR (/mask)

In-Depth Guide

Everything you need to know

Subnetting is the practice of dividing a network into two or more networks. It improves routing efficiency, enhances security, and helps manage the limited number of IP addresses.

Common CIDR Values:

/24: 256 IPs (Standard Office)
/32: 1 IP (Single Host)
/16: 65,536 IPs (Large Enterprise)
/8: 16.7M IPs (Class A)