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IP Address Class Checker

Audit IPv4 & IPv6 addresses locally. Identify network class (Class A-E), private vs. public address scopes, default netmask/CIDR, and binary representation instantly.

Browser-BasedResponsive UIPrivacy-First
Privacy: IP parsing and class checks run locally in your browser. No addresses are stored or shared.
Example Addresses

1. Enter IP Address

Type a valid IP address to analyze its class and scope.

Want deeper subnet insight?

Use the CIDR Subnet Calculator for exact IPv4 prefix ranges, netmask conversions, and modern CIDR planning. It complements this IP class checker with subnet math and precise address-block detail.

Explore CIDR Subnet Calculator

2. Analysis Findings

IP Version-
IPv4 Network Class-
Address Scope-
Default Classful Netmask-
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How it works

How the IP Address Class Checker Works

Use this offline IP Address Class Checker to analyze IPv4 and IPv6 addresses in your browser without sending data to a server. The tool instantly identifies IPv4 network class, RFC 1918 private ranges, loopback/multicast scopes, and default classful netmask/CIDR values.

For IPv6 addresses, it detects link-local, unique local, loopback, multicast, and unspecified addresses while explaining that classful IPv6 categories do not apply. The binary representation section helps you understand how network and host bits are organized for IPv4 addresses.

This tool is useful for network troubleshooting, security reviews, and teaching how IPv4 classful addressing differs from modern CIDR notation. Everything runs locally in your browser, so no entered address is stored or transmitted.