An IP address is a unique number that identifies your device on the internet, the same way a street address identifies your home in the physical world
Every device that connects to the internet — your phone, laptop, tablet, smart TV — gets assigned an IP address. This number tells other computers and servers where to send information back to you. Without it, data sent to you would have nowhere to go. Think of it as a return address on a piece of mail: the recipient needs to know where to send their reply.
IP stands for Internet Protocol. The address itself is a series of numbers separated by periods. You might see one that looks like 192.168.1.5 (this is an older format called IPv4) or a longer string of numbers and letters like 2001:0db8:85a3:0000:0000:8a2e:0370:7334 (the newer format called IPv6). Both do the same job — they identify your device on a network.
Key Takeaways
- Your IP address is assigned by your internet service provider (ISP) or your home router, and it changes periodically unless you pay for a static one.
- Two types exist: IPv4 (four sets of numbers) and IPv6 (longer format with numbers and letters), and most devices use IPv4 today though IPv6 is becoming more common.
- Websites and services you visit can see your IP address, which reveals your approximate location and ISP but not your name or home address.
- A VPN (virtual private network) masks your real IP address by routing your traffic through another server, though it introduces its own privacy and security trade-offs.
Where your IP address comes from
Your ISP assigns a public IP address to your home internet connection. This is the address that identifies you to the wider internet. When you connect to your home Wi-Fi, your router then assigns a private IP address to each device on your network — your phone gets one, your laptop gets another, and so on. These private addresses only work within your home network; they are not visible to the outside internet.
Most public IP addresses are temporary. Your ISP may change yours every few days or every few months, depending on how their system works. Some people and businesses pay extra for a static IP address — one that stays the same — but most home users get a dynamic address that shifts over time. This is one reason why someone cannot easily track you down using only your IP address; it may belong to a different device by next week.
What information your IP address reveals
When you visit a website, that website's server logs your IP address. This means the site knows you visited, and it can look up roughly where you are located. IP geolocation databases can pinpoint your city or region with reasonable accuracy, though they are rarely precise enough to identify your exact street address. The website also knows which ISP assigned your address.
Your IP address does not reveal your name, email address, or phone number on its own. A website would need additional information — like a login, a form you filled out, or a cookie stored on your device — to connect your IP address to your identity. However, if you log into an account on that website, they now know both your IP address and who you are, and they can link future visits from that address to your account.
The difference between IPv4 and IPv6
IPv4 addresses use four sets of numbers (0 to 255 each), which creates roughly 4.3 billion possible addresses. When the internet was young, that seemed like plenty. Today, with billions of devices connecting to the internet, we have run out of new IPv4 addresses to assign. IPv6 uses a much longer format with numbers and letters, creating vastly more possible addresses — enough for every device on Earth to have multiple addresses.
Most devices and websites still use IPv4, but IPv6 is slowly becoming more common. Your device may actually have both an IPv4 and an IPv6 address at the same time. For your purposes as a home user, you do not need to choose between them or do anything differently. Your ISP and router handle the technical details automatically.
How a VPN changes your visible IP address
A VPN (virtual private network) is software that routes your internet traffic through a server in another location before it reaches its destination. When you use a VPN, websites see the IP address of the VPN server instead of your real IP address. This masks your location and ISP from the sites you visit.
A VPN does add a layer of privacy — websites cannot easily see where you actually are. However, it introduces trade-offs. The VPN company itself can see all your traffic, so you are trusting them not to log or sell your data. Some VPNs are more trustworthy than others, and there is no way to verify a VPN's privacy claims just by using it. Additionally, some websites block VPN users, and using a VPN can slow your connection slightly because your data travels a longer route. A VPN is useful if you want to hide your location from websites, but it is not a complete privacy solution on its own.
Why websites and apps need your IP address
Websites use your IP address for basic technical reasons: they need to know where to send the web page you requested. But they also use it for other purposes. Services track your IP address to detect fraud — if your account suddenly logs in from a different country, they may flag it as suspicious. Advertisers use IP addresses to build location-based profiles about you. Some websites use it to enforce regional restrictions, blocking access from certain countries.
Apps on your phone work the same way. When an app sends data to its company's servers, your IP address is included in that communication. The app company can see it, even if you never gave them permission to know your location. This is one reason why checking app permissions on your phone matters — you can see which apps request location access, and you can deny that permission even if the app still knows your approximate location from your IP address.
How to find your own IP address
If you want to see what IP address a website sees when you visit it, you can search "what is my IP" in any search engine. The results will show your public IP address — the one your ISP assigned to your home connection. This is the address visible to the outside internet.
To find your device's private IP address (the one your router assigned), the steps differ by device. On Windows, open Command Prompt and type "ipconfig". On Mac, go to System Preferences, click Network, and look for the address listed under your connection. On iPhone or Android, go to Settings, then Wi-Fi or Network, and tap the network you are connected to — the IP address appears there. These private addresses are only useful if you are troubleshooting your home network; they do not matter for your privacy or security on the wider internet.
Frequently Asked Questions
Can someone find my home address from my IP address?
Not directly. An IP address reveals your city or region and your ISP, but not your street address. Someone would need additional information — like your name and address from public records, or data from a data broker — to connect your IP address to your physical location. Your ISP could theoretically do this, since they assigned the address, but they are legally restricted from sharing that information without a court order.
Does using a VPN hide my IP address from my ISP?
No. Your ISP can still see that you are using a VPN and can see which VPN server you are connecting to, even though they cannot see the websites you visit. A VPN hides your IP address from the websites you visit, not from your ISP. If privacy from your ISP is your goal, a VPN alone will not achieve it.
Why do websites need to know my IP address?
Technically, websites need your IP address to send you the web page you requested — it is how data gets routed back to your device. Beyond that, websites use IP addresses to detect fraud, enforce regional restrictions, and build location profiles for advertising. You cannot hide your IP address from websites without using a VPN or similar tool, because the connection itself requires it.
Is my IP address the same on Wi-Fi and mobile data?
No. When you use Wi-Fi, you are using your home ISP's IP address (or your router's public address). When you switch to mobile data, your phone connects through your mobile carrier's network and gets a different IP address assigned by them. Websites will see different addresses depending on which network you are using.
What is a static IP address, and should I get one?
A static IP address is one that stays the same instead of changing periodically. Most home users do not need one — dynamic addresses work fine for browsing, email, and streaming. Static addresses are mainly useful for people running servers from home or needing consistent remote access to their devices. They cost extra from your ISP and are not worth the expense for typical home use.