实用工具

IP Subnet Calculator

🌐IP Subnet Calculator

IP Address

e.g. 192.168.1.0

CIDR Prefix (e.g. 24)

/8 to /32

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Detailed Guide Coming Soon

We're working on a comprehensive educational guide for the IP Subnet Calculator in your language. The content below is shown in English.

是什么 IP Subnet Calculator?

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An IP subnet calculator breaks an IP address space into smaller networks. CIDR (Classless Inter-Domain Routing) notation specifies how many bits belong to the network portion — /24 means 24 bits for network, 8 bits for hosts, allowing 254 usable host addresses. Subnetting is essential for network design, router configuration, and firewall rules.

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公式

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f(x)Subnet mask = n ones followed by (32−n) zeros in binary

如何 IP Subnet Calculator

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1IP addresses are 32-bit numbers (IPv4), written as 4 octets: e.g. 192.168.1.0
2CIDR /n means first n bits are the network address
3Subnet mask = n ones followed by (32−n) zeros in binary
4Network address = IP AND subnet mask
5Broadcast address = network address OR NOT(subnet mask)
6Usable hosts = 2^(32−n) − 2 (subtract network and broadcast addresses)

例题解析

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示例 1

已知:192.168.1.0/24

结果:Network: 192.168.1.0, Broadcast: 192.168.1.255, Hosts: 254

/24 gives 256 addresses, 254 usable

示例 2

已知:10.0.0.0/8

结果:Network: 10.0.0.0, Hosts: 16,777,214

Class A private range — 16 million hosts

实际应用

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Academic homework and exam preparation

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Engineering and architecture calculations

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Everyday measurement tasks around the home

Common CIDR Subnet Sizes

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CIDR	Subnet Mask	Usable Hosts	Typical Use
/30	255.255.255.252	2	Point-to-point links
/29	255.255.255.248	6	Small office
/28	255.255.255.240	14	Small network
/27	255.255.255.224	30
/24	255.255.255.0	254	Standard LAN
/16	255.255.0.0	65,534	Large campus
/8	255.0.0.0	16,777,214	ISP / Class A

常见问题

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What is Ip Subnet?

How accurate is the Ip Subnet calculator?

The calculator uses the standard published formula for ip subnet. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Ip Subnet calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Ip Subnet calculator use?

The core formula is: Subnet mask = n ones followed by (32−n) zeros in binary. Each step in the calculation is shown so you can verify the result manually.

参考资料

Mathematically verified

Reviewed October 2026

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IP Subnet Calculator