Subnet Calculator — IP, CIDR, Mask, Hosts | ExamineIP Tools

🖧 Subnet Calculator

Calculate network address, broadcast, host range, wildcard mask, binary representation and subnet splits for any IPv4 address.

Method 1 — CIDR notation

Enter IP address and prefix length (0–32)

Method 2 — IP + subnet mask

mask

Enter IP address and subnet mask in dotted decimal format

Invalid input. Please check your IP address and subnet mask.

Quick examples:

192.168.1.0 / 24

Class C Private

📍 Network Info

IP Address

—copy

Network Address

—copy

Broadcast Address

—copy

First Host

—copy

Last Host

—copy

🧮 Mask & Host Count

Subnet Mask

—copy

CIDR Prefix

—copy

Wildcard Mask

—copy

Total Hosts

—

Usable Hosts

—

💻 Binary Representation

Network bits (blue) vs Host bits (green) — /24 example = 24 blue, 8 green

Network bits Host bits

✂ Subnet Split

Divide into

#	Network	First Host	Last Host	Broadcast	Hosts

🔒

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📋 IPv4 CIDR Reference Table

📍 Network Address

The first address in a subnet. Identifies the network itself and cannot be assigned to a host. All host bits are set to 0.

📡 Broadcast Address

The last address in a subnet. Used to send data to all hosts on the network simultaneously. All host bits are set to 1.

🧮 Subnet Mask

A 32-bit number that separates network bits from host bits. /24 = 255.255.255.0. Network bits are 1, host bits are 0.

🌀 Wildcard Mask

The inverse of the subnet mask. Used in ACLs and routing protocols like OSPF. /24 wildcard = 0.0.0.255.

✂ Subnetting

Dividing a network into smaller subnets by borrowing bits from the host portion. Each additional bit doubles the number of subnets and halves the hosts per subnet.

🏷 IP Classes

Class A: 1.0.0.0/8, Class B: 128.0.0.0/16, Class C: 192.0.0.0/24. Private ranges: 10/8, 172.16/12, 192.168/16.

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