Public Ip Vs Private Ip Address is a key topic for IT support, help desk technicians, junior network administrators and anyone learning practical networking. This guide uses simple language, examples and troubleshooting steps so you can apply the idea at work.
- Beginner-friendly explanation
- Real IT support examples
- Commands you can practice safely
- Checklist for troubleshooting
What is a private IP address?
A private IP address is used inside a local network such as a home, office, lab, or company LAN. Common private ranges include 192.168.x.x, 10.x.x.x, and 172.16.x.x to 172.31.x.x.
What is a public IP address?
A public IP address is used on the internet. Your router, firewall, or cloud server may have a public IP that other systems can reach across the internet.
Why we use both
Most devices in homes and offices use private IP addresses. The router uses NAT to allow many private devices to share one public IP address.
Why IT professionals should care
Understanding public and private IP addresses helps with VPN setup, port forwarding, remote desktop, firewall rules, cloud networking and troubleshooting internet access.
Common mistakes
A common mistake is trying to access a private IP address from the public internet. Private IP addresses are not directly reachable unless VPN, routing, or port forwarding is configured.
Useful commands to practice
ipconfig
ip addr show
curl ifconfig.me
nslookup myip.opendns.com resolver1.opendns.com
tracert 8.8.8.8Practical troubleshooting checklist
- Identify whether the problem affects one device, one network, or many users.
- Check physical/Wi-Fi connectivity first.
- Confirm IP address, subnet mask, gateway and DNS settings.
- Compare with a working device on the same network.
- Document results before making changes.
Final thoughts
Strong networking basics make every IT job easier. Practice these concepts in a safe lab or home network, then use the same structured approach when troubleshooting real issues.
Educational disclaimer: This tutorial is for learning purposes. Test carefully and do not change production networks without permission, documentation and backup plans.
