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How to Use IP Calculator: Complete Guide (2026)
Learn how to use ip calculator free online — no signup, no download. Follow our step-by-step guide below.
What is IP Calculator?
Calculate IPv4 and IPv6 subnet information: network address, broadcast address, CIDR notation, wildcard mask, and usable host range. Supports CIDR notation (192.168.1.0/24) and subnet mask input. Essential for network engineers, DevOps, and cloud infrastructure planning.
- 100% browser-based — no data uploaded to servers
- Free to use — no signup required
- Instant results — no waiting
- Works on all devices — mobile, tablet, desktop
How to Use IP Calculator: Step-by-Step
- 1
Enter IP and subnet
Type an IPv4 or IPv6 address with CIDR suffix (e.g., 192.168.1.0/24).
- 2
View results
Network address, broadcast address, usable host range, total hosts, and subnet mask are displayed.
- 3
Copy results
Copy individual values or the full subnet report.
Common Use Cases
Cloud VPC planning
Calculate subnet sizes for AWS VPC, Azure VNet, or GCP VPC subnets.
firewall rule configuration
Determine the correct CIDR block for firewall allow/deny rules.
Network documentation
Generate subnet calculation reports for network architecture diagrams.
FAQ About IP Calculator
What is CIDR?
Classless Inter-Domain Routing. /24 means the first 24 bits are the network portion. /32 is a single host. Smaller number = larger subnet.
Why can't I use the network address or broadcast address?
Network address (all host bits 0) identifies the subnet. Broadcast address (all host bits 1) is for broadcast traffic. Neither can be assigned to a host.
Does this support IPv6?
Yes. Enter an IPv6 address with CIDR suffix (e.g., 2001:db8::/32). IPv6 subnetting works differently from IPv4 — typically /64 for LAN segments.
Ready to Try IP Calculator?
No signup. No download. 100% free.