Public IP vs Private IP Explained

When you check your IP address, you may see one address on a website and a different address in your device settings.

That can be confusing at first.

For example, an online IP checker might show something like:

203.0.113.42

But your laptop settings might show:

192.168.1.24

Both can be correct. They are just different types of IP addresses.

In this guide, you will learn the difference between public IP and private IP, why your devices use private addresses at home, how your router connects them to the internet and how to check your public IP online with the free What is my IP tool by Free Utilities Online.

What Is a Public IP Address?

A public IP address is an address that can be used on the public internet.

It is the IP address that websites, apps and online services usually see when your connection reaches them.

For example, when you visit a website, the website needs to send data back to your connection. Your public IP address helps make that possible.

A public IP can be associated with:

• your home internet connection;

• a mobile network;

• a business connection;

• a VPN server;

• a proxy;

• a data center;

• a hosting provider;

• a cloud server.

When people search for “what is my IP,” they usually want to see their public IP address.

What Is a Private IP Address?

A private IP address is used inside a local network.

For example, devices in your home Wi-Fi network may have private IP addresses like:

192.168.1.10
192.168.1.11
192.168.1.12

These addresses help your router identify each device inside the local network.

Your private IP is used by:

• your laptop;

• your phone;

• your tablet;

• your smart TV;

• your printer;

• your gaming console;

• your router;

• smart home devices.

Private IP addresses are not meant to be directly reachable from the public internet.

Quick Difference Between Public and Private IP

Simple rule:

Public IP = outside address
Private IP = inside network address

Your public IP is like the street address of your internet connection.
Your private IP is like the room number inside the building.

Common Private IP Address Ranges

Private IPv4 addresses usually come from these ranges:

10.0.0.0 – 10.255.255.255

172.16.0.0 – 172.31.255.255

192.168.0.0 – 192.168.255.255

If your device IP starts with 192.168, 10, or 172.16 through 172.31, it is probably a private IPv4 address.

Common home network examples:

192.168.0.1
192.168.1.1
192.168.1.24
10.0.0.1
10.0.0.42

Your router often uses one private IP as its local gateway address, and each device gets its own private IP inside the network.

Why Do We Need Private IP Addresses?

Private IP addresses are useful because most networks have many devices.

A home may have:

• two phones;

• a laptop;

• a tablet;

• a smart TV;

• a printer;

• a gaming console;

• smart lights;

• a router.

Instead of giving every device a separate public IPv4 address, the local network can use private IP addresses internally.

Then the router connects those devices to the internet through the public IP assigned by the internet provider.

This helps conserve public IPv4 addresses and keeps local network addressing organized.

How NAT Connects Private IPs to the Internet

NAT stands for Network Address Translation.

NAT lets many private devices share one public IP address.

A simplified flow looks like this:

Laptop private IP → Router → Public IP → Internet

Example:

Laptop: 192.168.1.24
Phone: 192.168.1.25
Tablet: 192.168.1.26
Router public IP: 203.0.113.42

When your laptop visits a website, the router translates the local private address into the public address used on the internet.

When the website responds, the router knows which private device should receive the response.

This is why several devices on the same Wi-Fi can show the same public IP address when checking online.

Why My Device IP Is Different from My Public IP

Your device settings usually show your private IP address.

An online IP checker usually shows your public IP address.

That is why the two values can be different.

Example:

Device IP: 192.168.1.24
Public IP: 203.0.113.42

This is normal.

Your device uses the private IP to communicate with your router and local network.
Your router uses the public IP to communicate with the internet.

Is 192.168 an Internet IP?

A 192.168.x.x address is a private IP address.

It is commonly used in home and office networks.

Examples:

192.168.0.1
192.168.1.1
192.168.1.100

These addresses are not normally reachable directly from the public internet.

If you see 192.168.1.1, it is often the local address of your router.

If you see 192.168.1.24, it may be your laptop, phone or another device inside your local network.

Is 10.x.x.x a Private IP?

Yes, addresses starting with 10. are usually private IPv4 addresses.

Examples:

10.0.0.1
10.1.2.3
10.10.10.10

This range is often used by:

• home routers;

• business networks;

• schools;

• offices;

• VPNs;

• internal infrastructure;

• cloud private networks.

A 10.x.x.x address usually identifies something inside a private network, not a public internet address.

Is 172.x.x.x Always Private?

No. Only part of the 172 range is private.

The private range is:

172.16.0.0 – 172.31.255.255

So these are private:

172.16.0.1
172.20.5.10
172.31.255.1

But this is not automatically private:

172.32.0.1

This is a common misunderstanding. Not every IP starting with 172 is private.

Can Two Devices Have the Same Private IP?

Two devices on the same local network should not use the same private IP at the same time.

If they do, there may be an IP conflict.

But devices on different private networks can use the same private IP without a problem.

For example:

Your laptop at home: 192.168.1.24
Someone else's laptop at home: 192.168.1.24

That is fine because they are on different local networks.

Private IP addresses can be reused in many separate networks.

Public IP addresses, on the other hand, need to be globally unique on the public internet.

Public IP and Your Router

In a typical home network, your router has at least two types of addresses:

1. A private IP inside your home network.

2. A public IP facing the internet.

Example:

Router local IP: 192.168.1.1
Router public IP: 203.0.113.42

Your devices use the router’s local private IP as the gateway.

The internet sees the router’s public IP.

This is why your router acts like the bridge between your private network and the public internet.

Public IP and Your ISP

Your public IP is usually assigned by your ISP, or Internet Service Provider.

Your ISP may assign:

• a dynamic public IP;

• a static public IP;

• an IPv4 address;

• an IPv6 address;

• a shared address through carrier-grade NAT.

Most home users have dynamic public IPs, meaning the address can change over time.

Business users, servers and remote access setups may use static IPs when they need a stable address.

Dynamic Public IP vs Static Public IP

A dynamic public IP can change.

It may change when:

• your router restarts;

• your ISP refreshes the lease;

• you switch networks;

• you reconnect after downtime;

• your provider changes routing.

A static public IP is designed to stay the same.

Static IPs are useful for:

• servers;

• VPN access;

• remote desktop;

• business firewalls;

• allowlists;

• self-hosted services;

• monitoring systems.

For everyday browsing, a dynamic IP is usually fine.

For hosting or stable remote access, a static IP may be more convenient.

Public IP and IPv6

Public and private IP concepts are most familiar with IPv4, but IPv6 works differently in some networks.

IPv6 has a much larger address space, so many devices can receive globally routable IPv6 addresses.

An IPv6 address may look like this:

2001:db8:85a3::8a2e:370:7334

This does not always mean the device is openly reachable from the internet. Firewalls and router rules still matter.

With IPv6, it is especially important to understand that “has a public-looking address” does not automatically mean “is exposed without protection.”

What Is CGNAT?

CGNAT stands for Carrier-Grade NAT.

With CGNAT, your ISP may place many customers behind a shared public IPv4 address.

A simplified flow:

Your device → Your router → ISP NAT → Shared public IP → Internet

This can happen because public IPv4 addresses are limited.

CGNAT can affect:

• port forwarding;

• self-hosted servers;

• remote access;

• online gaming;

• peer-to-peer apps;

• VPN hosting;

• camera systems;

• home lab access.

If port forwarding does not work even after configuring your router, CGNAT may be one possible reason.

How to Tell If You Might Be Behind CGNAT

You may be behind CGNAT if the WAN IP shown in your router does not match the public IP shown by an online IP checker.

Example:

Router WAN IP: 100.64.x.x
Online public IP: 203.0.113.42

You may also suspect CGNAT if:

• port forwarding does not work;

• your ISP does not provide a real public IPv4;

• remote access fails from outside your network;

• your router WAN IP is private or shared;

• online games or peer-to-peer services have strict NAT warnings.

The best way to confirm is to check your router WAN IP and compare it with your visible public IP.

Public IP and Port Forwarding

Port forwarding is used when you want outside traffic to reach a device inside your private network.

For example, you may want to access:

• a home server;

• a game server;

• a security camera;

• a NAS;

• a remote desktop service;

• a self-hosted app.

The basic idea:

Public IP:port → Router → Private IP:port

Example:

203.0.113.42:8080 → 192.168.1.50:80

Port forwarding requires caution because it exposes services to the internet.

Only forward ports when you understand the security risks.

Public IP and Firewalls

Firewalls often use public IP addresses for allowlists.

For example, a hosting provider may ask for your public IP so only your connection can access an admin panel.

Example:

Allow access from: 203.0.113.42

This is why checking your public IP matters for:

• SSH access;

• hosting dashboards;

• remote databases;

• internal tools;

• VPN portals;

• secure admin panels.

If your public IP changes, the allowlist may need to be updated.

Private IP and Local Network Troubleshooting

Private IPs are useful when troubleshooting your local network.

You may need a private IP to:

• access your router;

• connect to a printer;

• configure a NAS;

• open a local development server;

• connect to a smart home device;

• set up port forwarding;

• troubleshoot device conflicts;

• reserve a DHCP address.

Example:

Router: 192.168.1.1
Laptop: 192.168.1.24
Printer: 192.168.1.50
NAS: 192.168.1.80

Knowing the private IP helps devices communicate inside the same network.

Localhost Is Different

You may also see this IP address:

127.0.0.1

This is localhost.

It points back to the same device you are using.

Developers often use it for local servers:

http://127.0.0.1:3000

Or:

http://localhost:3000

Localhost is not your public IP and not the same as your router’s private IP. It means “this device.”

Public IP vs Private IP Examples

Home Wi-Fi Example

Laptop private IP: 192.168.1.24
Phone private IP: 192.168.1.25
Router private IP: 192.168.1.1
Public IP: 203.0.113.42

Websites see the public IP.

Your router sees the private devices.

Office Network Example

Employee laptop: 10.10.4.25
Printer: 10.10.4.80
Internal server: 10.10.10.15
Public office IP: 198.51.100.27

The office may use private IPs internally and one or more public IPs externally.

VPN Example

Your local private IP: 192.168.1.24
VPN internal IP: 10.8.0.12
Visible public IP: VPN server IP

When connected to a VPN, websites may see the VPN server’s public IP instead of your normal home IP.

Mobile Data Example

Phone internal/mobile network IP: private or shared
Visible public IP: mobile carrier IP

Mobile carriers often use shared address systems, so your public IP may be shared with many users.

Security Differences

A private IP is not directly reachable from the public internet in a typical home network.

That gives a basic layer of separation.

However, private IP does not mean “secure by default.”

You still need:

• router security;

• strong Wi-Fi passwords;

• updated devices;

• firewall rules;

• safe port forwarding;

• secure admin passwords;

• HTTPS for sensitive services;

• careful VPN configuration.

A public IP is more exposed because it can receive internet traffic, depending on firewall and routing rules.

If you run services on a public IP, security matters much more.

Privacy Differences

Your public IP can reveal approximate information about your connection.

It may show:

• ISP;

• country;

• region;

• city estimate;

• organization;

• VPN or proxy provider.

Your private IP usually only matters inside your local network.

A website cannot normally see your private 192.168.x.x address just because you visit it.

However, your public IP can still be part of tracking, security logs and analytics.

How to Check Your Public IP

The easiest way to check your public IP is to use an online tool.

With the free What is my IP tool by Free Utilities Online, you can quickly see the public IP address visible to websites and online services.

Use it when you want to:

• check your current public IP;

• test a VPN;

• compare Wi-Fi and mobile data;

• set firewall allowlists;

• troubleshoot website access;

• check IPv4 or IPv6;

• verify whether your IP changed.

This is usually faster than checking router settings.

How to Check Your Private IP

Your private IP is usually found in your device network settings.

On a home network, it may look like:

192.168.1.24

Or:

10.0.0.42

You can also often find connected device IPs in your router dashboard.

Private IPs are useful when configuring local devices, printers, servers and port forwarding rules.

How IP Location Lookup Fits In

An IP location lookup usually works with public IP addresses.

If you enter a public IP, the tool may estimate:

• country;

• region;

• city;

• ISP;

• organization;

• timezone;

• network information.

If you enter a private IP like 192.168.1.24, it will not identify a real public location because that address is only meaningful inside a local network.

Use IP location lookup for public IPs, not local private addresses.

Common Misunderstandings

1. “My 192.168 IP Is My Internet IP”

Not usually. A 192.168.x.x address is normally a private local IP.

Websites usually see your public IP instead.

2. “Every Device Has Its Own Public IP”

Not always. Many devices can share one public IP through a router and NAT.

3. “Private IPs Are Unique Everywhere”

Private IPs can be reused in many networks.

Your laptop and someone else’s laptop can both use 192.168.1.24 in different homes.

4. “Public IP Means Anyone Can Access My Device”

Not automatically. Firewalls, routers and NAT may block inbound traffic.

But public exposure should still be handled carefully.

5. “IP Location Works with Private IPs”

Private IPs do not map to public geographic locations.

Use public IPs for IP location lookup.

Public IP vs Private IP: Practical Summary

Use your public IP when you need to:

• check what websites see;

• test VPN changes;

• configure firewall allowlists;

• troubleshoot external access;

• check IP location;

• verify public network identity.

Use your private IP when you need to:

• access your router;

• connect to local devices;

• configure printers;

• set up local servers;

• troubleshoot home Wi-Fi;

• configure port forwarding;

• manage internal network devices.

Both are useful, but they are used in different places.

Related Free Network Tools

You may also find these tools useful:

• What is my IP

• IP Location Lookup

• GEOIP

Together, these tools help you check your public IP, understand approximate IP location and troubleshoot basic network information.

FAQ

What is the difference between public IP and private IP?

A public IP is used on the internet and can be seen by websites. A private IP is used inside a local network, such as your home or office Wi-Fi.

Is 192.168 a public or private IP?

Addresses starting with 192.168 are private IPv4 addresses. They are commonly used inside home and office networks.

Why is my public IP different from my device IP?

Your device IP is usually a private local address. Your public IP is the address your router or network uses to communicate with the internet.

Can two devices have the same private IP?

Two devices on the same local network should not share the same private IP. But devices on different private networks can use the same private IP without conflict.

Can websites see my private IP address?

Websites usually see your public IP address, not your private local IP address. Private IPs are mainly used inside your local network.

Final Tip

Public and private IP addresses solve different problems.

Your private IP helps devices communicate inside your local network. Your public IP helps your connection communicate with the internet.

Try the What is my IP tool to check your visible public IP address, and use IP Location Lookup if you want to see approximate public IP location information.