What Is an IP Address? Everything You Need to Know
The Address That Connects You to the Internet
Every device on the internet needs an address so other devices can find it and send data to it. That address is called an IP address, short for Internet Protocol address. Think of it like a postal address for your computer, phone, or tablet. Without it, the internet simply would not work. When you visit a website, your device sends a request from its IP address to the server IP address, and the server sends the page back to yours.
How Devices Get IP Addresses
Most devices get their IP address automatically through a protocol called DHCP (Dynamic Host Configuration Protocol). When you connect to a WiFi network or plug in an ethernet cable, your router assigns your device a local IP address. Your router itself gets a public IP address from your Internet Service Provider (ISP). This all happens in the background without any action from you.
IPv4 vs IPv6
IPv4 addresses look like 192.168.1.1, four groups of numbers separated by dots. Each group ranges from 0 to 255. This gives about 4.3 billion possible addresses, which seemed limitless in the 1980s but is not nearly enough for today's billions of connected devices.
IPv6 was created to solve this shortage. IPv6 addresses look like 2001:0db8:85a3:0000:0000:8a2e:0370:7334, eight groups of hexadecimal numbers. This provides a virtually unlimited number of addresses (340 undecillion, to be exact). The transition from IPv4 to IPv6 is ongoing, and most devices now support both. Check which version your connection uses.
Public vs Private IP Addresses
Your public IP address is what the outside world sees. It is assigned by your ISP and identifies your network on the global internet. Every website you visit, every service you connect to, sees this address. You can check your public IP here.
Your private IP address is used inside your local network. Addresses like 192.168.x.x or 10.x.x.x are private. Your router uses a technology called NAT (Network Address Translation) to let multiple devices share one public IP while each having their own private address internally. Learn more about the differences in our public vs private IP guide.
Dynamic vs Static IP Addresses
Dynamic IPs change periodically. Most home internet connections use dynamic IPs because ISPs can reuse addresses efficiently. Your IP might change every few hours, days, or weeks. Static IPs never change. They are typically used for servers, businesses, or anyone who needs a consistent address. Static IPs cost extra from most ISPs.
What Your IP Address Reveals
Your IP address reveals more than you might expect. It shows your approximate geographic location (usually accurate to the city level), your ISP, and your connection type. Combined with other data like your browser fingerprint, it can be used to build a detailed profile of your online activity. Websites, advertisers, and even governments use IP addresses for tracking, targeting, and surveillance.
Use our IP Lookup tool to see exactly what information any IP address exposes. For a deeper dive into the different types of addresses, read our guide on IP address types.
Why Your IP Matters for Privacy
Because your IP is visible to every server you connect to, it is the primary way your online activity is linked back to you. Your ISP maintains logs mapping your IP to your identity. Hiding your IP with a VPN, proxy, or Tor is the first step toward online privacy. But even with a VPN, you should verify it is working properly. Run a DNS leak test and WebRTC leak test to make sure your real address is not leaking through.
Start With the Basics
Understanding your IP address is the foundation of internet privacy and security. Check your current IP address to see what you are exposing right now. From there, you can take steps to protect yourself, whether that means using a VPN, configuring your router, or simply being more aware of how your data travels across the internet.