What are the IPv4 address classes?

Class A (1-126), Class B (128-191), Class C (192-223), Class D (224-239) multicast, Class E (240-255) experimental.

What is a subnet mask?

A subnet mask separates the network portion from the host portion of an IP address. Default masks: Class A 255.0.0.0, Class B 255.255.0.0, Class C 255.255.255.0.

Network Engineering & Subnetting

IPv4 Address Analyzer

Enter any IPv4 address to get class, subnet mask, network ID, broadcast address, binary breakdown, and more. Essential for networking students and professionals.

IPv4 Address

Format: xxx.xxx.xxx.xxx (0-255 each octet)

IP Class

Address Type

Private

📡 Binary Representation

11000000.10101000.00000001.00000001

🌐 Default Subnet Mask

255.255.255.0

CIDR: /24

🏠 Network ID

192.168.1.0

📢 Broadcast Address

192.168.1.255

🔄 Wildcard Mask

0.0.0.255

📊 Host Range

192.168.1.1 – 192.168.1.254

Total hosts: 254

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📖 Understanding IP Classes

Class A: 1–126 (default mask 255.0.0.0) – large networks.
Class B: 128–191 (255.255.0.0) – medium networks.
Class C: 192–223 (255.255.255.0) – small networks.
Class D: 224–239 (multicast), Class E: 240–255 (experimental).

🔗 Learn more: Wikipedia – IPv4 | Subnetting

🧠 Private vs Public IPs

Private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.
Public IPs are globally routable on the internet.
Loopback: 127.0.0.1 (localhost).

💡 Pro Tip

Use CIDR notation (e.g., /24) to quickly identify subnet mask. This tool shows all default classful details. For custom subnets, adjust the mask manually in advanced tools.