IPv4 Subnet Calculator

Enter an IP address and CIDR prefix to calculate network address, broadcast address, subnet mask, available hosts, and IP range

Enter IP Address / CIDR

Quick CIDR:

Subnet Calculator Guide

CIDR Reference

/8 — Class A network, 16,777,214 hosts
/16 — Class B network, 65,534 hosts
/24 — Class C network, 254 hosts
/30 — Point-to-point link, 2 hosts
/32 — Single host route

Use Cases

Network planning and IP address allocation
Firewall rule configuration
Route table CIDR calculation
Cloud server security group setup