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Subnet Calculator

Calculate subnet mask, wildcard, usable range and total hosts.

About Subnet Calculator

Subnet Calculator helps you design and understand IP subnetworks for routers, switches, servers, and LAN environments. Subnetting is the process of dividing a larger network into smaller networks to improve management, reduce broadcast traffic, and increase security. This tool can help you calculate subnet mask, network ID, broadcast address, and the usable IP range.

Why Subnetting is Important

  • Efficient IP address management
  • Separate networks for departments or VLANs
  • Better routing performance and security
  • Reduce unnecessary broadcast traffic

How to Use

  1. Enter an IP and subnet/cidr (example: 192.168.0.10/24)
  2. Click Calculate
  3. View usable range, gateway suggestion, and broadcast info

FAQ

How many usable IPs exist in a subnet?
In most subnets, usable hosts = total IPs minus 2 (network + broadcast).

Can I use this tool for IPv6?
Subnetting is different in IPv6. This calculator is mainly for IPv4 subnet calculations.

📘 Quick Guides
What is an IP address?
An IP is a network identity used for routing traffic. Lookup helps detect ISP, ASN and region.
Why DNS matters?
DNS records control your website and email routes. Wrong records can break access instantly.
CIDR & Subnet basics
CIDR defines IP blocks like /24. Subnet tools help calculate range and usable hosts.