ToolPal

子网计算器

通过IP地址和CIDR表示法计算子网信息。获取网络地址、广播地址、主机范围、子网掩码等。

输入带CIDR前缀的IP地址，例如 192.168.1.0/24

网络地址192.168.1.0
子网掩码255.255.255.0
广播地址192.168.1.255
第一个可用主机192.168.1.1
最后一个可用主机192.168.1.254
通配符掩码0.0.0.255
总主机数256
可用主机数254
IP类别C
地址类型私有

二进制表示

IP地址: 11000000.10101000.00000001.00000000
子网掩码: 11111111.11111111.11111111.00000000
网络: 11000000.10101000.00000001.00000000

使用方法

通过IP地址和CIDR表示法计算子网信息。获取网络地址、广播地址、主机范围、子网掩码等。

  1. 1Type an IP address with its CIDR prefix into the input field — for example, 192.168.1.0/24. Or click one of the example buttons below the field to auto-fill a common network.
  2. 2The calculator instantly shows the network address, subnet mask, broadcast address, first and last usable hosts, total and usable host counts, IP class, and whether it is a private or public range.
  3. 3Check the Binary Representation section at the bottom to see the IP address, subnet mask, and network address in dotted binary notation — useful for visualizing how the subnet mask splits the address.
  4. 4Use the wildcard mask output directly in Cisco ACLs or OSPF configurations.
  5. 5Try the quick-fill examples (10.0.0.0/8, 172.16.0.0/12, etc.) to compare class A, B, and C subnets side by side.

主要功能

  • Instant CIDR calculation — network address, mask, broadcast, and host range appear as you type
  • Binary representation — see the IP and mask in dotted binary to understand bit-level subnet logic
  • Wildcard mask output — ready to paste into Cisco ACLs and routing configurations
  • Private/public detection — identifies RFC 1918 private address ranges automatically
  • Example quick-fill — common subnets (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/24) to explore immediately

常见问题

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