What Is IP Address?
An IP address (Internet Protocol address) is the unique numerical label assigned to your device when it connects to the internet — for example 203.0.113.42. It works like a return address: every website and online service you contact sees your IP and uses it to send data back. Because IP addresses are allocated geographically by internet providers, your IP also reveals your approximate location (city or region) and identifies your ISP — which is exactly what a VPN hides by replacing your real IP with the VPN server's.
What your IP address reveals
Any website you visit logs your IP address. From it, services can derive your approximate geographic location (typically city-level), identify your internet service provider, and — combined with cookies and accounts — build a profile of your activity over time. Advertisers use IP for geo-targeting and tracking; streaming services use it to enforce regional licensing; some sites use it for price discrimination.
Your IP doesn't directly reveal your name or street address, but your ISP knows exactly which customer was assigned which IP at any moment, and can be compelled to disclose that link. This is why IP is the central identifier a privacy-focused VPN is built to obscure.
IPv4 vs IPv6, public vs private, static vs dynamic
IPv4 addresses (like 203.0.113.42) are the original format and are running out; IPv6 (like 2001:db8::1) is the newer, vastly larger address space. A VPN that only routes IPv4 while your device also has IPv6 connectivity can leak your real IPv6 address — which is why IPv6 leak protection matters.
Your public IP is the address the internet sees (assigned by your ISP); your private IP is the internal address your router gives each device on your home network. Most home IPs are dynamic (they change periodically); a static IP stays the same. A VPN replaces your public IP with the server's, leaving your private network addresses untouched.
How a VPN hides your IP address
When you connect to a VPN, your traffic is routed through the VPN server, so websites see the server's IP address instead of yours. Your real IP is masked behind the VPN's, and your apparent location becomes wherever the server is. This is the mechanism behind both the privacy benefit (sites can't log your real IP) and the access benefit (you appear to be in another country).
For the masking to be complete, the VPN must also prevent DNS leaks and IPv6 leaks, which can expose your real identity even while your IP appears changed. A quality VPN handles all three together.
Frequently Asked Questions
Does a VPN change my IP address?
Yes — when connected, websites and services see the VPN server's IP address instead of your real one, and your apparent location becomes the server's location. Your real IP is hidden from the sites you visit (though your VPN provider can see it, which is why a no-logs policy matters).
Can someone find my location from my IP address?
Approximately — an IP reveals your city or region and your ISP, not your exact street address. However, your ISP knows precisely which customer held which IP at any time and can be legally compelled to disclose it. A VPN breaks this by replacing your IP with the server's, so sites only see an approximate location for the VPN server.
What's the difference between IPv4 and IPv6 for VPNs?
IPv4 is the older, dwindling address format; IPv6 is the newer, much larger one. The VPN-relevant issue is leaks: if a VPN only routes IPv4 while your connection also uses IPv6, your real IPv6 address can leak. Quality VPNs include IPv6 leak protection or disable IPv6 in the tunnel entirely.
Is my IP address the same as my identity?
Not directly — an IP doesn't contain your name. But it's a strong identifier: combined with your ISP's records, cookies, and logged-in accounts, it links your activity to you. That's why hiding your IP with a VPN removes one major tracking layer, though it doesn't make you fully anonymous on its own.