Server & Network

IP Class Finder

Calculate your IPv4 address class (A/B/C/D/E), whether it's private or public, default network mask/CIDR value, network and broadcast address for free.

IP Class Finder
Conclusion
Information

About IP Class Finder

IP addresses are one of the fundamental building blocks of the Internet. Each IPv4 address is unique according to the value of its first octet. to the class It belongs to class (A, B, C, D, or E), and this class largely determines the purpose for which the address is used. IP Class Finder The tool instantly analyzes the IPv4 address you enter, displaying its class, whether it belongs to a private or public network, its default network mask and CIDR representation, network address, and broadcast address all on a single screen.

Class A The addresses are designed for large enterprise networks with first octet values ranging from 1 to 126; the default mask is /8. Class B Medium-sized networks with addresses ranging from 128 to 191, Class C The addresses, ranging from 192 to 223, target small home and office networks. Class D (224–239) for multicast, Class E (240–255) is reserved for research and experimental use.

Private IP addresses — blocks 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 — are not routed over the internet; they are used only on local networks. The tool automatically checks whether the entered address belongs to one of these blocks. This is a practical resource for network administrators, students, and those preparing for certification exams. free IP class calculatorIt works entirely in your browser; no data is sent to the server.

How to use it?

Step by step

  1. Enter the code you want to analyze in the input box. IPv4 address in summer (example: 192.168.1.1 or 10.0.0.1).
  2. Calculate Click the button or exit the box and the result will be calculated automatically.
  3. On the results card class (A/B/C/D/E), scope (Private / General) default mask and CIDR View their information.
  4. Calculated for the default class mask network address and broadcast address Note down the values.
FAQ

Frequently Asked Questions

IPv4 addresses are divided into five classes—A, B, C, D, and E—based on the value of their first octet. This classification determines how large a network the address represents and for what purpose it is used. For example, class A is suitable for very large networks, while class C is suitable for small home/office networks.

Private IP addresses (10.x.x.x, 172.16–31.x.x, 192.168.x.x) are not routed over the internet; they are only used within the local network. Public IP addresses, on the other hand, are directly accessible over the internet and are unique. Your home router usually assigns private IPs to your devices, while outgoing networks use a single public IP.

127.0.0.1 is technically in the A-class range; however, the 127.0.0.0/8 block is completely loopback It is reserved for (loopback) addresses. This tool marks addresses 127.x.x.x as loopback and excludes them from the private/public scope.

CIDR (Classless Inter-Domain Routing) is a shortcut for representing a network mask using a slash. For example, the CIDR equivalent of the mask 255.255.255.0 is /24; this indicates that the first 24 bits of the IP address constitute the network portion. This tool displays the default mask of the selected class in both dotted-decimal and CIDR formats.

A broadcast address is used to send data to all devices on a network simultaneously. It is the last address in the network; it is not assigned to any device. Network and broadcast addresses are necessary for determining the number of devices that can be used in network design and subnet calculations.
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