Qu'est-ce qu'une adresse IP client ?
A Client IP is the unique address assigned to the device or application making a request to a server. It identifies the source of the request and plays a central role in communication across the internet.
Qu'est-ce que l'adresse IP du client ? (Explication des proxys)
Une adresse IP client est l'adresse unique attribuée à un appareil accédant à Internet ou à un réseau. Cette adresse IP identifie l'emplacement et la connexion du client. Lors de l'utilisation d'un proxy, l'adresse IP du client est souvent masquée pour préserver la confidentialité et l'anonymat.
Use Cases
Fraud Detection
Websites often track Client IPs to spot suspicious activity, such as multiple login attempts from different locations in a short period.
Rate Limiting
Servers may use the Client IP to limit the number of requests a single user can make, protecting resources from overload.
Geolocation Services
A Client IP can be mapped to a geographic region, helping businesses deliver localized content or comply with regional rules.
Best Practices
Respect Privacy
Mask or anonymize Client IPs when logging them to avoid exposing sensitive user details unnecessarily.
Handle Proxies Correctly
When dealing with proxies, check headers like X-Forwarded-For to correctly identify the original Client IP, if available.
Secure Your Logs
Always protect stored Client IP data with encryption and access controls, as it can be considered personal data under certain privacy laws.
Conclusion
A Client IP is the address that identifies the origin of a request on the Internet. It is vital for communication, security, and traffic management, and proxies play a major role in shaping how Client IPs are seen by servers.
Frequently Asked Questions
What is the difference between a Client IP and a Server IP?
The Client IP belongs to the requester (your device or proxy), while the Server IP belongs to the machine that provides the content or service.
Can websites see my real Client IP if I use a proxy?
No, if configured correctly. The proxy replaces your Client IP with one of its own, masking your identity.
Why is the Client IP important for proxies?
It defines the relationship between user and proxy—every request must present a Client IP, making it the foundation for masking, rotation, and anonymity.
Is a Client IP personal data?
In many jurisdictions, yes. Laws like GDPR treat Client IP addresses as personal data because they can be used to identify a user.