What an IP address actually is
An IP address is the numeric label your connection uses to send and receive data on the internet. Just as a postal service needs an address to deliver a letter and a return address to bring back a reply, every server you contact needs to know where to send its response. When you load a web page, your request carries your public IP address with it. Without one, the internet would have no way to route the answer back to you.
Two versions of the system are in use today. IPv4, the original, writes addresses as four numbers separated by dots, such as 203.0.113.10. It offers about 4.3 billion addresses — a number that once sounded infinite and has long since run out. IPv6 was created to replace it, using eight groups of hexadecimal numbers, such as 2001:db8::1, and an address space so large that exhaustion is not a practical concern. Many networks now run both at once, a setup called dual stack, which is why your address here may appear in either format depending on which protocol your browser chose for this connection.
Public, private and NAT: why your device shows a different number
The address on this page is almost certainly not the address configured on your computer or phone. Home and office networks use private ranges — addresses beginning with 192.168., 10., or 172.16. to 172.31. — that are only meaningful inside the local network. Your router performs Network Address Translation (NAT), holding the one public address your provider assigned and translating between it and the private addresses of every device in the building. To the outside world, the whole household or office appears as that single public address.
The same trick is used at larger scales. Mobile carriers and some broadband providers place customers behind carrier-grade NAT, so hundreds of subscribers may share one public IPv4 address. This is worth remembering before treating an IP address as proof of identity: at best, it identifies a connection at a moment in time, not a person, and not even necessarily a single household.
Why websites see your IP — and what they infer from it
Seeing your IP address is not a leak or a hack; it is a mechanical requirement of how the web works, and every site you visit receives it. What sites do with it varies. Most use it for security logs, abuse prevention and rough localisation — choosing a language, a currency, or the nearest content-delivery server. IP geolocation databases map addresses to approximate cities and providers, but they are educated guesses assembled from routing data, and they are frequently wrong at street level and sometimes wrong at country level, especially for mobile and satellite connections.
VPNs, proxies and other caveats
If you use a VPN, the address above is the VPN provider's exit address, not your provider-assigned one — which is precisely the point of the service, and also why a streaming catalogue or a bank may suddenly think you are abroad. Corporate proxies, privacy relays and the Tor network have the same effect. Conversely, a VPN does not make you anonymous: your browser still shares the language, timezone, screen and user-agent details listed above, and the combination can be distinctive. Finally, most home connections have dynamic addresses that change when the router reconnects or the lease expires, so yesterday's address may belong to a neighbour today.
How to use this tool
The address appears automatically when the page loads; press Refresh after connecting or disconnecting a VPN to see the change, and use Copy to paste the address into a support ticket or firewall rule. Comparing the server view with the browser view below it is also instructive: the two should broadly agree, and a mismatch in language or user agent can reveal a proxy rewriting your headers.
Frequently asked questions
Can someone find my home address from my IP?
Not from the address alone. Public lookups typically reveal only your provider and an approximate area, often the location of the provider's equipment rather than your home. Precise subscriber details are held by the provider and disclosed only through legal process.
Why does my IP keep changing?
Most residential providers assign addresses dynamically. Reconnecting, restarting the router or the expiry of a lease can all result in a new address. Businesses that host servers usually pay for a static address that never changes.
Is IPv6 better than IPv4?
IPv6 mainly solves address scarcity and removes the need for NAT in many setups. In everyday browsing you are unlikely to notice a speed difference; what matters is that the connection works on either protocol.
Does hiding my IP make me untraceable?
No. A VPN changes which IP address sites see, but logins, cookies, payment details and browser characteristics still identify sessions. Think of it as privacy from casual observation, not invisibility.
Related tools
- DNS Lookup — see which addresses a domain resolves to
- User Agent Parser — decode the browser string shown above
- Port Checker — test reachability of this connection's services
- Speed Test — measure this connection's throughput
- Subnet Calculator — work out ranges for private networks