What Is an IP Address?
Every device that communicates over the internet needs a way to be identified and reached. An IP address provides that identification. It is one of the fundamental building blocks of modern computer networks.
What does IP mean?
IP stands for Internet Protocol. The Internet Protocol defines rules for addressing devices and moving packets of data between networks.
When you visit a website, send an email, use an app, or connect to an online service, network devices use IP addresses to determine where information should come from and where it should go.
What does an IP address look like?
There are currently two major versions of IP addressing: IPv4 and IPv6.
IPv4 example
An IPv4 address is written as four numbers separated by periods:
192.168.1.10
Each section can contain a value from 0 to 255. IPv4 has been used for decades and remains extremely common today.
IPv6 example
An IPv6 address is longer and uses hexadecimal characters:
2001:db8:85a3::8a2e:370:7334
IPv6 was introduced largely because the available supply of IPv4 addresses is limited. IPv6 provides a vastly larger address space.
Why does your device need an IP address?
Imagine sending a package without writing a destination address on it. The delivery system would not know where to take the package.
Networks face a similar problem. When information travels across the internet, routers need addressing information so they can forward the data toward the correct destination.
IP addresses help make this possible.
How does an IP address work?
Internet communication is divided into small units called packets. These packets contain addressing information, including source and destination IP addresses.
A simplified sequence looks like this:
- Your device connects to a network.
- The device receives or uses an IP address.
- You request data from an internet service.
- Your request travels through one or more networks.
- Routers examine destination addressing information.
- The requested data is returned toward your network and device.
Many other technologies are involved in a real internet connection, but IP addressing is essential to the process.
Public and private IP addresses
Not every IP address serves the same purpose. A useful distinction is between public and private IP addresses.
| Type | Main purpose | Typical use |
|---|---|---|
| Public IP | Identifies an internet-facing connection | Communication across the internet |
| Private IP | Identifies devices inside a local network | Home, office, and internal networks |
For example, your phone and computer may each have their own private IP address inside your home network while sharing the same public internet connection.
Who assigns your IP address?
The answer depends on which address you are looking at.
Your internet service provider normally assigns the public IP address used by your internet connection. Inside a home or office network, a router commonly assigns private IP addresses to connected devices.
Addresses may be assigned automatically or configured manually depending on the network.
Is an IP address permanent?
Not necessarily.
Many internet connections use a dynamic IP address, which may change over time. Other services use a static IP address, which is intended to remain consistent.
Dynamic addresses are common for ordinary residential internet connections, while static addresses can be useful for servers, remote access, business systems, and other services that benefit from a predictable address.
Can an IP address reveal your location?
An IP address can often be associated with approximate geographic information, such as a country, region, or city. However, IP geolocation should not be confused with GPS-level location information.
Accuracy varies because IP addresses are allocated to networks and service providers rather than directly representing a person's exact physical location.
An IP address alone generally should not be treated as a precise street address.
Does every device have a different public IP address?
No.
Multiple devices inside the same home or office can share one public IPv4 address when accessing the internet. Technologies such as Network Address Translation (NAT) allow a router to manage communication for many private devices through a shared public connection.
This is one reason the IP address visible to websites may be different from the private IP address displayed in your device's local network settings.
Can your IP address change when using a VPN?
A VPN can change the public IP address that websites and online services see for your connection.
Instead of communicating directly with the destination service, your traffic passes through a VPN server. The destination typically sees the VPN server's public IP address rather than the public IP address assigned directly to your normal internet connection.
IP addresses and privacy
An IP address is necessary for normal internet communication, but it can also provide information about the network being used.
Websites, network administrators, security systems, analytics services, and internet providers may use IP addresses for purposes such as:
- routing network traffic,
- detecting suspicious activity,
- limiting abuse,
- estimating geographic region,
- troubleshooting network problems,
- and maintaining service security.
An IP address is therefore an important piece of network information, although it should not automatically be treated as a precise identifier of a specific individual.
How can I check my public IP address?
The easiest method is to use an IP lookup service. IPScope can detect the public IP address presented by your connection and display useful network information associated with it.
Remember that the public IP shown by an online lookup service may change if you switch networks, use mobile data, connect through a VPN, or receive a new address from your internet provider.
An IP address is the network address that helps internet-connected devices send and receive data. Public and private addresses serve different roles, IPv4 and IPv6 use different addressing formats, and the address visible on the internet may change depending on your network connection.
Related IP topics
This guide is part of the IPScope IP & Network Guides collection. Related guides will cover public and private IP addresses, IPv4 and IPv6, dynamic and static addressing, IP geolocation, VPNs, DNS, RDAP, ASN information, ports, and online privacy.
