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Can IP addresses can be used to uniquely identify individual users on the Internet?
At its core, an IP address is an online unique identifier. While every computer is given its own IP address, the outside world rarely has access to it. Routers, instead, connect to individual computers, and it’s the routers that then connect to the rest of the internet using their own individual IP address.
Can different devices have the same IP address?
An IP address conflict occurs when two or more devices on the same network are assigned the same IP address. Because of this setup, no two devices can have the same IP address on one network. If this happens, the network becomes confused by the duplicate IP addresses and can’t use them correctly.
How do you uniquely identify a Web user?
Here are 5 ways to identify your users:
- Using the user’s IP. Using an IP address is the most obvious solution of all.
- LocalStorage. A new feature of HTML5 is LocalStorage.
- Canvas Fingerprinting.
- User Behavior.
- Using the ETAG.
Is there any way to uniquely identify such users?
Is there any way to uniquely identify such users? Yes, there are lots of ways: Device fingerprinting: use the HTTP header (mainly User Agent, but the other headers and their order can help as well)
Is it possible for different people to have the same public IP address?
As I understand it, two computers cannot have the same public (external) IP address unless they are connected via the same router. If they are connected via the same router, then they can have (share) the same public IP address yet have different private (local) IP addresses.
How can I get the internal IP address of a user?
You can get users’ internal IP address even from the Internet by using HTML5 & WebRTC. You can check out the article Local IP discovery with HTML5 WebRTC: Security and privacy risk? for more information and try it on http://net.ipcalf.com/.
Can you tell if someone has changed their IP address?
No. Many connections are behind NAT (One public gateway IP address for many people), or use DHCP (frequently changed IP addresses). An IP address is one of the worst ways of identifying a user. Share