IP & Privacy Guide

What Is an IP Address?

An Internet Protocol (IP) address is a numerical label used to identify a network interface and route data to the correct destination. Every time you open a website, send a message or use an online service, IP addresses help the network know where requests came from and where responses should go.

How an IP address works

Your device usually connects to a router or mobile network, which then communicates with the wider internet. Websites normally see the public IP address assigned to that internet connection, not the private address used by your phone or computer inside the local network. You can check the address visible to websites with the Terbit IP public IP checker.

An IP address identifies a connection or network endpoint; it is not a permanent personal identity. Multiple people and devices may share one public address, and the address may change when a router reconnects, a mobile device changes networks or an internet provider updates its allocation.

IPv4 and IPv6

IPv4 addresses contain four decimal groups, such as 192.0.2.1. Because the number of IPv4 addresses is limited, providers often use network address translation so several devices can share one public address. IPv6 uses a much larger hexadecimal address space and was designed to support the continuing growth of internet-connected devices. Read our detailed IPv4 versus IPv6 comparison.

Public and private addresses

A public IP address is routable across the internet. A private address is used within a home, office or other local network and is not routed directly on the public internet. Your router normally translates traffic between the two. Our public versus private IP guide explains the distinction.

What an IP address can reveal

An IP lookup can commonly estimate the internet provider, country and broad region associated with an address range. It does not normally reveal a person’s name, precise home address or exact live position. City-level results can be inaccurate because databases describe network allocations rather than GPS locations. Learn more in our IP geolocation accuracy guide.

Practical privacy steps

Keep devices and routers updated, use encrypted websites, secure Wi-Fi with a strong password and avoid treating an unfamiliar IP address as proof of a person’s identity. A VPN can change the public address visible to websites, but it does not make every online activity anonymous or replace account and device security.

Reviewed 10 September 2026. Educational information only; IP data is approximate and does not guarantee identity, location, security or anonymity.