IP ADDRESS GUIDE
What Is an IP Address?
An Internet Protocol address is a numerical identifier used to deliver data between devices and networks. Every time you open a website, send an email or use an online service, network equipment uses IP addresses to move requests and responses toward the correct destination. The address is essential for routing, but it is not a personal name, a precise GPS coordinate or proof of who used a device.
Published by the Terbit Editorial Team · Reviewed 20 October 2026
Quick answer
An IP address tells internet-connected systems where traffic should be sent at a particular time. Your home router may have one public address visible to websites, while phones, laptops and smart devices use private addresses inside the home network. Internet providers can change public addresses, and mobile devices often receive a different address when switching between Wi-Fi and cellular data.
How an IP address moves internet traffic
When you enter a web address, the Domain Name System helps translate the name into an address that computers can route. Your device sends packets through the local router and internet provider toward the destination. The website then sends its response back toward the public address from which the request arrived. Routers examine addressing information and choose a path; they do not need to know your identity to perform this basic task.
The route is rarely a single direct connection. Traffic can pass through several networks, exchange points and content-delivery systems. This explains why an IP lookup may show the name of an internet provider, cloud platform or VPN company instead of the organisation you expected.
Public and private IP addresses
A public IP address is reachable through the wider internet and is normally assigned to your connection by an internet provider, mobile operator, workplace, hotel or VPN service. Websites usually observe this outward-facing address. Multiple people or devices can share it through network address translation, so the address alone does not identify a particular person.
Private addresses are used inside local networks. Common IPv4 private ranges include 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. A router translates connections between these internal addresses and the public internet. Seeing a private address in browser diagnostic output is not automatically evidence of a privacy leak; interpretation depends on the browser, test method and surrounding results.
IPv4 and IPv6
IPv4 uses 32-bit addresses such as 203.0.113.25 and provides a limited address space. The example belongs to a documentation range and should not be treated as a working destination. Because public IPv4 addresses are scarce, many networks share them among devices or customers.
IPv6 uses 128-bit addresses and provides a much larger address space. A device can use IPv4, IPv6 or both. Dual-stack networks support both protocols, while some networks translate between them. IPv6 availability does not by itself make a connection safer, and an unsuccessful IPv6 test does not prove that IPv6 is disabled everywhere on the device.
Static and dynamic addresses
A static address is intended to remain stable, often for a server, business connection or service that must be reached consistently. A dynamic address can change when a connection reconnects, a provider renews a lease, a router restarts or a device moves to another network. Many household and mobile connections are dynamic.
If your IP changes, it does not necessarily indicate an attack or configuration problem. First compare the network, provider and protocol. Moving from hotel Wi-Fi to mobile data should normally produce a different public address because the traffic now leaves through a different network.
What an IP address can reveal
An IP address can often support an estimate of country, region, internet provider, network owner and connection type. The accuracy varies by database and network. City results may point to an ISP routing centre, registration address or gateway rather than the device’s physical location.
An IP address does not normally reveal a person’s name, street address, exact room or live GPS position to an ordinary website. Providers may hold subscriber records, and lawful processes may connect historical address assignments with an account, but that is different from what a public lookup tool can determine.
Worked example: home Wi-Fi and mobile data
Suppose a phone on home Wi-Fi displays one public IPv4 address and the household provider’s name. After Wi-Fi is disabled, the phone uses a mobile operator and displays another address. The country remains the same, but the city changes by 100 kilometres. This result is consistent with two providers using different gateways. It does not mean that the phone travelled to the displayed city.
If several devices on the same home Wi-Fi show the same public IPv4 address, that can be normal because the router shares one outward-facing address. Their private addresses inside the home will still differ.
How VPNs and proxies affect the result
A VPN or proxy can cause websites to observe the service’s public address instead of the connection’s ordinary exit address. To compare, record the result before connecting, enable the trusted service, then reload Terbit IP in the same browser. A changed address and provider are evidence that the tested browser traffic used a different exit route.
This is a comparison, not automatic VPN detection or a guarantee of security. Split tunnelling may exclude some applications, existing sessions may remain open, and DNS or WebRTC behaviour requires separate interpretation. Use the WebRTC test and IPv4/IPv6 test for additional browser-visible evidence.
Practical checks when the result looks wrong
- Reload once and confirm whether the device is using Wi-Fi, mobile data, workplace internet or a hotspot.
- Check whether a VPN, privacy relay, proxy or security application is active.
- Compare the provider name and country before focusing on the city.
- Test again after changing networks, but do not publish the full address in public support forums.
- If access to an account is blocked, follow that service’s verification process rather than assuming the lookup city is your exact location.
Privacy and security limitations
Hiding or changing a public IP does not make a device anonymous. Websites can use account logins, cookies and other signals, while malicious software can create risks unrelated to the visible address. Conversely, seeing your normal address is not proof that the device is compromised. Treat IP information as one diagnostic signal, not a complete security assessment.