Overview

Use this IP Network Checker to quickly see whether two IPv4 addresses are on the same subnet. It accepts dotted masks like 255.255.255.0 or CIDR like /24 and works well for help desk triage, network design, labs, and exam prep.

How it Works

This tool converts each IP and mask to 32-bit integers and compares their network addresses with a bitwise AND. It also calculates the wildcard mask, broadcast, usable hosts, and first/last usable IPs. Edge cases like /31 point-to-point and /32 host routes are handled correctly.

Examples

Example: 192.168.1.10 and 192.168.1.200 with /24 share a network; with /25 they don't. Another: 10.0.0.1 and 10.0.1.1 with 255.255.255.0 are on different subnets.