IP Subnet Calculator Online Free

Key Features

Why Use a Subnet Calculator?

Subnetting is a fundamental skill in networking. Manually calculating subnet ranges, broadcast addresses, and host counts is tedious and error-prone. This tool instantly gives you all the values you need for network configuration, firewall rules, router setup, and IP address planning. Whether you're studying for a CCNA exam, designing a corporate network, or configuring cloud infrastructure, a subnet calculator saves time and prevents costly mistakes.

Benefits

• •Avoid manual calculation errors in network design
• •Plan IP address ranges quickly and accurately
• •Configure firewalls and routers with correct values
• •Understand network topology and addressing
• •Study for CCNA, CompTIA Network+, and other certifications
• •Design cloud VPC and subnet configurations

How to Calculate a Subnet

1. 1Enter the IP address in the first field (e.g. 192.168.1.0)
2. 2Enter the CIDR prefix in the second field (e.g. 24 for /24)
3. 3Click 'Calculate' to compute all subnet values
4. 4View network address, subnet mask, and broadcast address
5. 5Note the first and last usable host addresses
6. 6Check total and usable host counts for capacity planning

Common Subnet Sizes Reference

/24 = 254 usable hosts (most common for small networks). /16 = 65,534 usable hosts (medium networks). /8 = 16,777,214 usable hosts (large networks). /30 = 2 usable hosts (point-to-point links). /32 = 1 host (loopback, host routes). /28 = 14 usable hosts (small office segments). /22 = 1,022 usable hosts (medium office networks).

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