Every device connected to the internet has an IP address — a number that identifies it on the network. If you've ever filled in a sign-up form, used a streaming service, or just opened any website, your IP address was visible to the other end. Most people are vaguely aware of this but unclear on what an IP actually reveals, and why it matters.
IP stands for Internet Protocol. An IP address is a unique numerical label that identifies a device on a network. It serves two purposes: identification (which device you are) and location (where to send data back to).
When you type a URL into your browser, your computer sends a request to the website's server. The request includes your IP address as the return address. Without it, the server would have no way of sending the response back to you. It's the postal address of the internet.
There are two versions of the Internet Protocol in active use today.
IPv4 is the original, designed in the 1980s. It uses 32-bit addresses written as four numbers separated by dots, like 203.0.113.45. Each number ranges from 0 to 255, giving roughly 4.3 billion possible addresses. That sounded like a lot in 1981; today, with billions of phones, laptops, smart TVs, and IoT devices, we have effectively run out.
IPv6 is the modern replacement. It uses 128-bit addresses written in hexadecimal, like 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The address space is so vast that we could give every grain of sand on Earth its own IP address billions of times over. IPv6 has been gradually rolling out since 2012; most modern broadband and mobile networks now support it.
Most internet users have both an IPv4 and an IPv6 address simultaneously, with the network choosing which to use for each connection.
There's an important distinction that often confuses people:
192.168.x.x or 10.0.x.x. These are not routable on the public internet — they only exist inside your home or office network.When you visit a website, the website sees only your public IP. Your router uses Network Address Translation (NAT) to route the response back to the specific device that made the request.
An IP address reveals less than people often fear, but more than is comfortable. Here's what's typically visible:
What an IP cannot reveal:
The exception is sites that combine your IP with other tracking signals — cookies, browser fingerprints, account logins — to build a fuller profile.
Geographic content restrictions. Streaming services use your IP to determine which content you can access. Netflix, BBC iPlayer, and Hulu all serve different libraries by country. This is why VPNs that route your traffic through other countries are popular — they make websites think you're somewhere else.
Security and fraud detection. Banks, payment processors, and email providers flag logins from unexpected IPs as suspicious. If you log into your bank from a different country, expect a security check.
Rate limiting and bans. Websites use IP addresses to enforce rate limits ("no more than 100 requests per minute") and to ban abusive users. Your IP can be blocked from sites if it's been used for spam or attacks — even if you weren't responsible.
Targeted advertising. Advertisers use your approximate location, derived from your IP, to show region-specific ads. A pizza chain advertising to your city, a politician targeting your district.
The lookup runs through ip-api.com — a single query, no logging, no retention. Once you close the page, the information is gone.
If you want websites to see something other than your real IP, three common options exist:
Each has trade-offs around speed, privacy, and trust. A VPN protects your IP from websites but means the VPN provider can see your traffic. Choosing a VPN you trust is the central decision.
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