ENAn IP address, short for Internet Protocol address, is a numerical label assigned to a device or network interface. It allows data to travel to and from that interface across a network.
The address a website sees does not necessarily belong to one device. Your phone and laptop may have different addresses on your home network but share the same public IP when they visit a website. That distinction matters when you check your connection, use a proxy, or try to understand what a website knows about you.
How Does an IP Address Work?
When you open a website, your browser needs an address it can connect to. DNS helps resolve the domain name into an IP address. The connection then uses IP addresses to send data between your device and the service.
The process usually follows these steps:
- Your browser obtains an IP address for the domain, often through a DNS lookup or a cached result.
- Your device sends packets toward that address. Each packet carries source and destination IP information.
- Routers forward the packets toward the destination network.
- The server sends data back through the network to your connection.
A domain can resolve to several IP addresses. A large website may use different servers for different visitors, so its address is not necessarily fixed.
An IP address also does not identify a particular page. The domain and the URL path help the web service determine which content you requested.
What Are the Main Types of IP Addresses?
IP addresses are commonly described by their version, scope, and assignment method. These describe different properties. One address can be IPv4, public, and dynamic at the same time.
IPv4 vs. IPv6
IPv4 uses 32 bits. An IPv4 address is usually written as four numbers separated by dots, such as 192.168.1.20. Each number ranges from 0 to 255.
IPv6 uses 128 bits and is written in hexadecimal groups separated by colons. It provides a much larger address space. An address such as 2001:db8::20 uses double colons to shorten a sequence of zero groups. This example comes from a range reserved for documentation.
Both versions are in use. A device may have IPv4 and IPv6 addresses at the same time, and different connections may use different versions.
Public vs. Private IP Addresses
A public IP address is intended for communication across the public internet. A private IPv4 address is used inside a local network, such as your home or office.
Common private IPv4 ranges are:
- 10.0.0.0 to 10.255.255.255
- 172.16.0.0 to 172.31.255.255
- 192.168.0.0 to 192.168.255.255
These ranges are reserved by RFC 1918. Different homes can use the same private addresses because their local networks are separate.
A public address does not mean a device accepts every incoming connection. A firewall can still block access. Some addresses have other restrictions. IPv6 link-local addresses, for example, are used only on the local network link.
Static vs. Dynamic IP Addresses
A static IP is configured to remain stable. It can be useful for a server or a service that allows access from a specific address.
A dynamic IP is assigned through an automatic process and may change. It can also stay the same for a long time. Restarting a router does not guarantee a new public address because the provider may assign the previous one again.
Static describes the intended stability of an assignment. It does not mean the address can never change. A provider or administrator can replace it.
| Property | Main Options | What It Describes |
|---|---|---|
| Version | IPv4 or IPv6 | The Address Format |
| Scope | Public or Private | Where the Address Is Intended to Be Used |
| Assignment | Static or Dynamic | Whether the Assignment Is Intended to Stay Stable |
Which IP Address Do Websites See?
A website receives the source address of the connection that reaches its infrastructure. On a typical home IPv4 network, that is a public address used by your router or your internet provider.
Your laptop might use 192.168.1.20 while your phone uses 192.168.1.21. The router uses network address translation, usually called NAT, to map these local addresses to a public address. It also tracks port numbers to send replies to the right device. Both devices can then appear under the same public IP. Some providers add another translation layer that lets several customers share an address.
If a connection goes through a proxy, the receiving website generally sees the proxy's exit address. A rotating proxy can change that exit address according to the provider's settings. This is separate from your home provider assigning a dynamic IP.
| Connection | Address the Website Commonly Sees |
|---|---|
| Home IPv4 Network Using NAT | The Public Address Used for the Outgoing Connection |
| Traffic Routed through a Proxy | The Proxy's Exit Address |
| Direct IPv6 Connection | The Source IPv6 Address Selected for That Connection |
An IP lookup reports the address visible to that lookup service. It does not prove that every browser feature follows the same route. A WebRTC leak can occur when browser communication exposes an IP address that the proxy or VPN was expected to hide.
What Can an IP Address Reveal about You?
An IP lookup can often show the network operator, an approximate location, and a likely connection category, such as mobile or hosting. These details come from records and databases associated with the address.
They are not measurements taken directly from your device. Two lookup services may report different cities or classify the same network differently.
MaxMind explains that IP geolocation estimates a geographic area rather than pinpointing a person's home. A mobile connection may appear near a network gateway. A proxy may show the location associated with its exit address.
An IP address alone does not reveal your name, passwords, or complete browsing history. However, a website can record it alongside account activity and visit times. Those records become part of your digital footprint.
A service may know who you are because you signed in. It can then associate your account with the IP used during that visit. The login identifies the account, while the IP adds information about the connection.
Shared addresses also affect how those records should be read. Visits from one public IP could come from one person or several people sharing a home or office network. The address alone cannot settle that question.
How Can You Find Your IP Address?
First decide which address you need.
- For your public address, open an IP lookup service from the browser and connection you want to check.
- For your local address, open your device's network settings and inspect the active Wi-Fi or Ethernet connection.
- For a proxy connection, run the lookup inside the browser using that proxy.
A difference between your local address and an online result is normal on a network using NAT. If you see separate IPv4 and IPv6 results, your connection may support both.
A DNS leak test answers a different question. It reports information about the DNS resolvers involved in the test. Those resolver addresses do not need to match your browser's public IP.
IP Address vs. MAC Address, Domain Name, and Browser Fingerprint
An IP address tells the network where to send packets. The other identifiers below serve different purposes.
| Term | What It Represents | Important Distinction |
|---|---|---|
| IP Address | An Address Used to Send Packets Across a Network | It Can Change or Be Shared through a Common Exit |
| MAC Address | An Identifier Used for Communication on a Local Network Link | It Is Not Normally Passed to a Remote Website through Internet Routing |
| Domain Name | A Readable Name That DNS Can Resolve to Addresses | One Domain Can Use Multiple IP Addresses |
| Browser Fingerprint | A Combination of Browser and Device Signals | Those Signals Can Remain Similar after the IP Changes |
A browser fingerprint may include screen properties, browser information, and rendering behavior. Changing the network route does not automatically change those properties.
Likewise, two browsers using the same IP do not necessarily share cookies or login state. Network addressing and browser state need to be considered separately.
Frequently Asked Questions
Can two devices have the same IP address?
Yes. They can share a public IP through NAT. Devices on separate private networks can also use identical local addresses. Within the same local network, accidentally assigning the same address to two interfaces can cause an address conflict.
Does private browsing hide my IP address?
No. Private browsing mainly changes how the browser retains local browsing data. It does not, by itself, route traffic through a different network. A website can still receive the public IP used by that connection.
Does changing my IP address log me out of websites?
Not automatically. Cookies and tokens may keep you signed in after the address changes. A website's session management rules determine whether it accepts the session, requests another check, or ends access.
Is a static IP the same as a dedicated proxy?
No. Static describes address stability. Dedicated describes whether the proxy resource is reserved for one customer. A static residential proxy should be evaluated for both properties because a stable address is not necessarily exclusive.
Why does my IP location show the wrong city?
The result may reflect your provider's infrastructure or an outdated database entry. It can also describe a proxy or VPN exit. Check which connection the lookup used before treating a city mismatch as a configuration problem.
