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Subnet / CIDR Calculator & IP Converter

Calculate IPv4 and IPv6 subnet ranges, network masks, CIDR notation, usable IP host ranges, and broadcast addresses online.

Quick Summary: Free online subnet and CIDR calculator. Calculate subnet masks, usable host ranges, broadcast IP, and wildcard masks with 100% client-side privacy.

Input & Controls

Source Input 0 characters

Result Output

What is Subnet / CIDR Calculator & IP Converter?

Subnet Calculator is a comprehensive networking utility for cloud architects, DevOps engineers, and network administrators. Convert CIDR prefixes into usable IP ranges, subnet masks, wildcard masks, and binary addresses.

Unlike traditional online utilities that upload your sensitive payloads to a remote server, TechnoLila's Subnet / CIDR Calculator & IP Converter executes 100% locally in your web browser using modern JavaScript APIs, HTML5 Canvas, and SVG vector rendering. No barcodes, asset IDs, Wi-Fi credentials, tokens, or proprietary payloads ever leave your device.

How to Use Subnet / CIDR Calculator & IP Converter Online

1. Enter an IP address with CIDR prefix (e.g., 192.168.1.0/24 or 10.0.0.1/16).
2. Alternatively, select your subnet mask from the dropdown menu.
3. Instantly view usable host range, broadcast address, netmask, total hosts, and binary breakdown.

Subnet / CIDR Calculator & IP Converter Example

Example Input:

192.168.1.10/24

Example Output:

Network: 192.168.1.0
Mask: 255.255.255.0
Usable Range: 192.168.1.1 - 192.168.1.254
Broadcast: 192.168.1.255
Total Usable Hosts: 254

Common Use Cases

• AWS VPC & Azure VNet Configuration: Plan non-overlapping subnets across cloud VPCs and availability zones.
• Firewall & Security Groups: Calculate precise CIDR IP blocks for ingress and egress rules.
• Network Engineering: Subdivide classful networks into efficient variable-length subnets (VLSM).

Common Mistakes & Gotchas

• Forgetting that the network address and broadcast address cannot be assigned to individual host devices.
• Confusing CIDR prefix length (e.g. /28) with total usable hosts (14 hosts).

Frequently Asked Questions

How does a /24 CIDR prefix translate to total IP addresses?

A /24 subnet contains 2^(32-24) = 256 total IP addresses, with 254 usable hosts (1 network address and 1 broadcast address reserved).

What is the difference between a subnet mask and wildcard mask?

A subnet mask (e.g. 255.255.255.0) specifies network bits using 1s. A wildcard mask (0.0.0.255) is the bitwise inverse used in Cisco ACLs and OSPF configurations.