A router uses both public and private IP addresses to connect devices inside a local network to the internet. The private IP address identifies the router and devices within the home or office network, while the public IP address identifies the entire network to the wider internet.
What Is A Private IP Address?
A private IP address is an address used inside a local network. Devices such as computers, smartphones, smart TVs, and printers use private IP addresses to communicate with the router and each other.
Common private IP address ranges include:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
A typical home router might use:
192.168.1.1
as its private address, while connected devices receive addresses such as:
192.168.1.20
192.168.1.25
These addresses are not accessible directly from the internet.
What Is A Public IP Address?
A public IP address is assigned by an internet service provider (ISP) and represents your network on the internet.
Example:
203.0.113.25
When you visit websites, send emails, or use online services, your public IP address is used to identify where internet requests are coming from.
Unlike private addresses, public IP addresses must be globally unique.
How A Router Uses Both Addresses
A router acts as a bridge between your private network and the internet.
The process works like this:
- Your device sends a request using its private IP address.
- The router receives the request.
- The router replaces the private address with its public IP address.
- The request travels across the internet.
- The response returns to the router.
- The router sends the information back to the correct device.
This process is called Network Address Translation (NAT).
How To Find Your Router’s Private IP Address
The router’s private IP address is usually called the default gateway.
On Windows:
- Open Command Prompt.
- Run:
ipconfig
- Look for:
Default Gateway
Example:
Default Gateway . . . . . . : 192.168.1.1
On Android:
- Open Wi-Fi settings.
- Select the connected network.
- Look for the gateway or router address.
How To Find Your Public IP Address
Your public IP address can be viewed through:
- Your router administration page
- Your ISP account dashboard
- Online IP checking services
The public address may change over time if your ISP provides a dynamic IP.
Static Vs Dynamic Public IP Addresses
Most home internet connections use dynamic public IP addresses.
Dynamic IP Address
A dynamic IP:
- Changes periodically
- Is assigned automatically by the ISP
- Is common for residential users
Static IP Address
A static IP:
- Remains the same
- Is often used by businesses
- Helps with hosting servers and remote access
ISPs usually charge extra for static IP services.
Why Private IP Addresses Are Important
Private IP addresses help networks operate efficiently because millions of devices can use the same private ranges without conflict.
For example, many homes around the world can use:
192.168.1.1
for their routers because these addresses only exist within local networks.
Security Differences Between Public And Private IPs
Private IP addresses are not directly exposed to the internet, which provides an additional layer of protection.
However, a router’s public IP can be targeted by:
- Automated scanning
- Network attacks
- Unauthorized access attempts
Security practices include:
- Keeping router firmware updated
- Using strong Wi-Fi passwords
- Changing default router login credentials
- Disabling unnecessary remote access features
Join The Discussion
Do you know whether your internet connection uses a static or dynamic public IP address? Have you ever needed to access your router settings or troubleshoot networking issues using IP addresses? Share your experiences and networking tips with the community.
