IP Subnet Calculator

Calculate IP ranges, subnet masks, CIDR notation, and network details instantly.

Input

IP Address

CIDR Notation

Quick Examples:

• Home Network: 192.168.1.0/24 (254 hosts)
• Small Office: 10.0.0.0/16 (65,534 hosts)
• Single Host: Any IP/32 (1 host)

Results

Enter an IP address and CIDR to see results

About IP Subnet Calculation

An IP subnet calculator helps network administrators divide networks into smaller subnetworks (subnets) for better organization, security, and performance. Understanding subnetting is essential for efficient network design and management.

Common CIDR Notations

/32 - Single host (1 IP)
/31 - Point-to-point link (2 IPs, RFC 3021)
/30 - Point-to-point link (4 IPs, 2 usable)
/24 - Standard Class C network (256 IPs, 254 usable)
/16 - Standard Class B network (65,536 IPs)
/8 - Standard Class A network (16,777,216 IPs)