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IP Subnet Calculator

🌐IP Subnet Calculator

e.g. 192.168.1.0

/8 to /32

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คืออะไร 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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สูตร

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

วิธี IP Subnet Calculator

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

ตัวอย่างที่มีคำตอบ

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ตัวอย่าง 1
กำหนดให้:192.168.1.0/24
ผลลัพธ์:Network: 192.168.1.0, Broadcast: 192.168.1.255, Hosts: 254

/24 gives 256 addresses, 254 usable

ตัวอย่าง 2
กำหนดให้:10.0.0.0/8
ผลลัพธ์:Network: 10.0.0.0, Hosts: 16,777,214

Class A private range — 16 million hosts

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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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CIDRSubnet MaskUsable HostsTypical Use
/30255.255.255.2522Point-to-point links
/29255.255.255.2486Small office
/28255.255.255.24014Small network
/27255.255.255.22430
/24255.255.255.0254Standard LAN
/16255.255.0.065,534Large campus
/8255.0.0.016,777,214ISP / Class A

คำถามที่พบบ่อย

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Q

What is Ip Subnet?

A

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

Q

How accurate is the Ip Subnet calculator?

A

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.

Q

What units does the Ip Subnet calculator use?

A

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

Q

What formula does the Ip Subnet calculator use?

A

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.

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Mathematically verified
Reviewed October 2026
Our methodology

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