The IP address as an identifier
Every device that connects to the internet does so with an IP address — a numerical identifier assigned by your ISP or network. Your IP is visible to every web server you connect to, every app you use, and every service you access online. It is not a secret, and was never designed to be one. Understanding what it actually reveals — and more importantly, what it does not reveal — is genuinely useful for anyone thinking about online privacy.
What your IP reveals: geolocation
The most significant thing your IP reveals is your approximate location. IP geolocation works by mapping blocks of IP addresses to geographic regions based on registration data, routing information, and observed traffic patterns. Accuracy varies considerably by location and ISP.
At country level, IP geolocation is accurate essentially all the time. At city level, accuracy drops: major cities in dense broadband markets are typically identified correctly, but rural areas, mobile connections, and ISPs that route through regional hubs may show an incorrect city — sometimes hundreds of miles away. Street address accuracy from IP alone is essentially zero, regardless of what some websites claim.
What your IP reveals: your ISP and ASN
Your IP makes it easy to identify your Internet Service Provider and ASN (Autonomous System Number). The ISP name and network are all publicly registered data attached to the IP block. This reveals your ISP and whether you are on a residential or business connection — information used by streaming services to enforce geographic restrictions and by fraud detection to distinguish human users from automated scripts.
What your IP does NOT reveal
Despite common misconceptions, your IP alone does not reveal your name, home address, email, or phone number. Obtaining personal information from an IP requires a legal request to the ISP, who can match it to a specific subscriber account. This is only possible for law enforcement with appropriate legal authority — websites and individuals cannot do this.
Your IP also does not uniquely identify you forever. Residential IPs are dynamic — they change when your router reconnects, which can be daily or weekly. Even static IPs identify a household, not an individual person.
How VPNs change what is visible
A VPN replaces your visible IP with the VPN server's IP. A website sees the VPN's IP and its associated geolocation — typically the data centre where the VPN server is located. This provides real privacy from the website's perspective, but VPN IP ranges are widely known and often blocked by streaming services and fraud detection systems. It does not make you anonymous either — the VPN provider can still see your real IP and traffic.
Try it yourself
My IP Lookup tool shows exactly what any website can see about you from your IP: your public IP, city and country estimate, ISP name, and ASN. Run it with and without a VPN to see what actually changes. It is a quick, concrete way to understand what you are broadcasting to every site you visit.