What Is an IP Address? How It Works and Why It Matters
Every time you open a website, stream a video, play an online game or send a message, your device relies on something called an IP address.
Most internet users rarely see their IP address, but it plays an essential role behind the scenes. It helps networks identify devices and ensures internet traffic reaches the correct destination.
So, what is an IP address, how does it work, and why does it matter? Here's a simple explanation.
What Is an IP Address?
IP stands for Internet Protocol. An IP address is a numerical address used by Internet Protocol to identify network interfaces and help route data to the correct destination.
You can think of it somewhat like an address used for delivering a package. A network needs to know where information should go and where it came from.
An IPv4 address might look like this:
192.0.2.67
An IPv6 address looks very different:
2001:0db8::53
Both perform an addressing function, but they use different formats and provide dramatically different numbers of possible addresses.
How Does an IP Address Work?
When you visit a website, several processes happen extremely quickly.
Imagine that you type a website address into your browser. Humans prefer memorable domain names, while networks ultimately need addressing information to route traffic.
The Domain Name System (DNS) helps connect a domain name with its associated IP address.
A simplified version of the process looks like this:
- You enter a website address in your browser.
- Your device uses DNS to find the IP address associated with that domain.
- Your device sends a request across the network.
- Routers use addressing information to help move packets toward their destination.
- The server responds and the requested content is delivered back to your device.
This process can happen so quickly that users usually never notice it.
What Is IPv4?
IPv4 stands for Internet Protocol version 4.
IPv4 addresses are 32 bits long and are normally displayed as four decimal numbers separated by periods.
For example:
192.0.2.67
A 32-bit address space provides just over four billion possible unique addresses.
That sounded enormous during the earlier development of the internet, but the rapid growth of computers, smartphones and other connected devices placed significant pressure on the available IPv4 address space.
What Is IPv6?
IPv6 is the newer Internet Protocol addressing system designed with a vastly larger address space.
IPv6 addresses are 128 bits long and are normally written using hexadecimal characters separated by colons.
For example:
2001:0db8::53
IPv6 provides approximately 340 undecillion possible addresses, dramatically expanding the number of unique addresses available compared with IPv4.
IPv4 vs IPv6
| Feature | IPv4 | IPv6 |
|---|---|---|
| Address Length | 32-bit | 128-bit |
| Format | Decimal numbers | Hexadecimal |
| Separator | Periods | Colons |
| Example | 192.0.2.67 | 2001:0db8::53 |
Public vs Private IP Address
Another important distinction is between public and private IP addresses.
Public IP Address
A public IP address is used for communication across the public internet. Internet service providers typically assign addressing to customer connections.
In a typical home network, multiple devices may access the internet through the same router and appear externally through a shared public IPv4 address.
Private IP Address
Private IP addresses are used inside local networks.
Your smartphone, laptop, television and game console may each have their own private address on your home Wi-Fi network.
Your router helps manage communication between these local devices and the wider internet.
Static vs Dynamic IP Addresses
IP addresses can also be described as static or dynamic.
Dynamic IP Address
A dynamic IP address can change over time. Internet service providers commonly assign addresses dynamically from an available pool.
For ordinary home internet users, this is usually sufficient.
Static IP Address
A static IP address is intended to remain consistent rather than changing regularly.
Static addresses can be useful in certain server, business and networking environments where a predictable address is important.
Why Are IP Addresses Important?
Without an addressing system, internet-connected networks would not know where to route data.
IP addresses help enable everyday online activities including:
- Opening websites
- Sending and receiving data
- Streaming online content
- Using cloud services
- Online gaming
- Video and voice communication
- Connecting smart devices
They are a fundamental part of how devices communicate across IP networks.
What Is the Difference Between an IP Address and DNS?
An IP address provides addressing information used by Internet Protocol.
DNS, meanwhile, makes the internet easier for humans to use by connecting memorable domain names with IP addresses.
For example, instead of remembering a numerical server address, you can enter a domain such as radarnext.net into your browser.
DNS helps your device find the addressing information associated with that domain.
Can Your IP Address Reveal Your Exact Location?
An IP address can sometimes be associated with an approximate geographic area or internet service provider, but it should not be treated like a precise GPS coordinate.
The apparent location can differ from the device's actual physical location because of ISP network design, mobile networks and other routing factors.
Does Your IP Address Change?
It can.
If your internet service provider uses dynamic addressing, your public IP address may change over time.
Switching between Wi-Fi and mobile data can also mean using different network addresses because you are connecting through different networks.
Does Every Device Have the Same IP Address?
Not necessarily.
Devices inside a home network normally have different private IP addresses so the router can distinguish between them.
However, several devices can appear to internet services as coming through the same public IPv4 address when they share a home internet connection.
Why Was IPv6 Created?
The biggest reason was address capacity.
IPv4 provides just over four billion possible addresses, and the pool of unallocated IPv4 addresses eventually became exhausted as internet usage expanded.
IPv6 uses a 128-bit address space, providing an enormously larger number of possible addresses and supporting the continued growth of internet-connected devices.
IP Address FAQ
What does IP stand for?
IP stands for Internet Protocol, a set of rules used for communication and addressing across IP networks.
What is an example of an IP address?
An IPv4 example is 192.0.2.67. IPv6 uses a different hexadecimal format.
Is an IP address permanent?
Not always. Many internet connections use dynamic IP addresses that can change, while static addresses are designed to remain consistent.
Is IPv6 replacing IPv4?
IPv6 was created to address the limitations of IPv4's much smaller address space. However, IPv4 and IPv6 continue to coexist across today's internet.
Is an IP address the same as a domain name?
No. A domain name is a human-friendly name, while IP addressing is used by networks to route data. DNS connects the two.
Final Thoughts
An IP address is one of the fundamental building blocks of internet communication.
It helps identify network destinations and allows data packets to be routed between devices and services.
IPv4 remains widely used, while IPv6 provides the much larger address space needed as the number of connected devices continues to grow.
Understanding the basics of IP addresses, DNS, IPv4, IPv6 and public and private networking can make it much easier to understand what happens behind the scenes whenever you connect to the internet.
Radar Next explains the technology behind the devices and services you use every day.