Subnet / CIDR Calculator

Calculate IP subnet mask, network address, broadcast address, IP range, wildcard mask, and usable host count from IP and CIDR prefix.

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核心特性与隐私安全保证

  • ✓ 100% 浏览器本地运行：您的输入数据绝不离开本地设备，不会上传至任何远程服务器。
  • ✓ 实时无延迟输出：零网络等待时间，随打随算，毫秒级快速剪贴板复制。
  • ✓ 永久完全免费无限制：无需注册登录，没有付费门槛，没有每日使用频率限制。
  • ✓ 严格遵循国际标准：基于 RFC、ISO 及 W3C 官方网络协议规范构建。

IP Subnet Mask & Network Range Calculator

Calculate IPv4 network boundaries, wildcard masks, and total usable hosts instantly. Works offline in your browser for DevOps, sysadmins, and network engineers.

技术规格与架构设计

Execution Environment:
100% Client-Side Browser Sandbox
Data Privacy:
Zero Server Storage / No Tracking
Processing Speed:
Real-time local CPU execution
Cross-Platform:
Works on Windows, macOS, Linux, iOS & Android

Local Processing for Network Tools

This tool runs within your browser sandbox using modern Web APIs. Inputs are processed on your local device CPU, avoiding network latency and ensuring your data is never stored on external servers or accessible to third parties.

1

Provide Input

Enter, paste, or upload your data into the input field above.

2

Configure & Process

The tool immediately processes your input in real time according to your chosen settings.

3

Copy or Save

Use the Copy button to copy the output to your clipboard, or download the result to your device.

开发者说明: All operations execute locally in your browser memory for maximum speed and data privacy.

常见应用场景

  • Design VPC and subnet ranges in AWS, Google Cloud, or Azure
  • Calculate usable IP addresses for DHCP pools and router configuration
  • Verify wildcard masks for Cisco ACLs and firewall rules
  • Convert CIDR notation (/27, /28) to dotted decimal subnet masks (255.255.255.224)

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常见问题

What is a CIDR notation?
CIDR (Classless Inter-Domain Routing) notation specifies an IP address and its associated network prefix length (e.g. /24). The prefix number indicates how many leading bits are used for the network ID.
How many usable hosts in a /24 subnet?
A /24 subnet provides 256 total IP addresses, of which 254 are usable for hosts (excluding the network address .0 and broadcast address .255).
What is the difference between Subnet Mask and Wildcard Mask?
A Subnet Mask uses 1s for the network portion (e.g. 255.255.255.0). A Wildcard Mask is the bitwise inverse (e.g. 0.0.0.255), commonly used in Cisco ACLs and OSPF routing.
Is my IP data sent to any server?
No — all subnet calculations are performed entirely in your browser using local JavaScript.