A Subnet Mask is used in IP networking to divide an IP address into a network and host portion. It helps routers determine which part of an IP address refers to the network and which part refers to a device on that network.

Key Points About Subnet Masks

• Separates IP addresses into network and host segments.
• Works with both IPv4 address and IPv6 networks.
• Helps manage large networks efficiently.
• Used in conjunction with Gateway to route IP traffic.
• Essential for My IP location and network configuration.

Example of Subnet Mask

• IPv4: 255.255.255.0 → typical home network
• IPv4: 255.255.0.0 → medium size network
• IPv4: 255.0.0.0 → very large network

How to Find My Subnet Mask

• Windows: `ipconfig` in Command Prompt.
• Mac: System Preferences → Network → Advanced → TCP/IP.
• Android/iOS: Settings → Wi-Fi → network details.
• Check your current IP address alongside subnet mask for troubleshooting.

Frequently Asked Questions (FAQ)

• What is my subnet mask? — The number that separates network and host portions of your IP address.
• How is it related to IP? — It defines the network your IP belongs to.
• Can subnet masks change? — Yes, depending on network configuration.
• Is it used in IPv6? — IPv6 uses prefix length instead of traditional subnet mask.
• Why is it important? — For network management, routing, and My IP location.