DevToolBox免费
博客

IP 子网计算器

计算子网掩码、网络地址和广播地址。

Network192.168.1.0
Broadcast192.168.1.255
Subnet Mask255.255.255.0
Wildcard0.0.0.255
First Host192.168.1.1
Last Host192.168.1.254
Hosts254
𝕏 Twitterin LinkedIn

评价此工具

3.6 / 5 · 227 人评价

更多工具

🌐IP 转二进制转换器01进制转换器01文本 ↔ 二进制转换器🔢十六进制转十进制

Recommended

VercelDeploy your frontend instantlyGitHub CopilotAI pair programming

保持更新

获取每周开发技巧和新工具通知。

无垃圾邮件，随时退订。

Enjoy these free tools?

☕Buy Me a Coffee

How to Use

  1. Enter an IP address (e.g., 192.168.1.100)
  2. Enter the CIDR prefix length (e.g., /24) or subnet mask
  3. View the calculated network address, broadcast, and host range
  4. Copy any value you need for your network configuration

Common Use Cases

  • Planning IP address allocation for cloud VPCs
  • Configuring firewall rules with correct subnet ranges
  • Studying for network certification exams (CCNA, CompTIA)
  • Troubleshooting network connectivity issues

Frequently Asked Questions

What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation like /24 indicates how many bits are used for the network portion of an IP address. /24 means 24 network bits and 8 host bits, allowing 254 usable hosts.
How do I calculate the number of hosts in a subnet?
The formula is 2^(32-prefix) - 2 for IPv4. The subtraction accounts for the network address and broadcast address. A /24 subnet has 2^8 - 2 = 254 usable hosts.
What is the difference between network and broadcast address?
The network address is the first address in a subnet (all host bits 0) and identifies the subnet. The broadcast address is the last (all host bits 1) and sends packets to all hosts in the subnet.