adresse ip

IP address: definition

The IP address is a series of numbers interspersed with periods. Unique for each computer, it above all makes it possible to identify a device with the aim of distinguishing it and connecting it to the rest of the network. Several Internet Protocol (IP) coexist, but the fourth version is currently the most used of all. Discover the essential things to remember about this essential concept to understand how the Web works.

What is the IP address?

An IP address is actually a unique number for every device connected to the Internet. Like car number plates, it allows us to trace information and know the identity of the person at the controls. IPV4 or Internet Protocol version 4 is a 32-bit code. It consists of 4 numbers ranging from 0 to 255. The 4 are separated by 3 points.

When the combinations with 4 series ( are exhausted, the protocol switches to another version. Current technology is already in the 6th variation. IP addresses with 128 bits make it possible to identify an infinite number of terminals. Either way, an IP number can be permanent or dynamic. In both cases, it remains unique for each device.

How to find out your IP?

The site is one of the great specialists in IP addresses. Simply open this site and it will automatically display the requested information. In addition to the Internet protocol type, the platform also provides various other information facilitating identification. In particular, there is the name of the host which is “” to use the previous example. The port is listed as 37756 and the Proxy IP would be does not just determine the IP, Port and Proxy. It can also go deeper by indicating the geographical area, country and city. Naturally, the name of the Internet service provider can be given if necessary. This site can detail your identifier, but also those of others, in this case the IP of a website.

Permanent or dynamic identifier, what’s the difference?

A static IP address is simply frozen. The 4-digit combination remains the same. With a dynamic Internet protocol. For the first category, the series is entered by the Internet service provider. The other results more from an automatic allocation of DHCP. It changes every time you restart your computer. A fixed IP represents a prime target for hackers if you do not protect yourself. An address that changes all the time remains less easy to trace.

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To find out if your address is fixed or dynamic, you can go to and note the assigned IP address. Reopen the platform after restarting your PC. Check if the combination is the same or not. Otherwise, a tool offered by this site allows you to recognize a dynamic IP. You will get confirmation immediately.

Public and local IP addresses, what do they mean?

When you connect to the Internet, the ADSL box, router or smartphone obtains a public IP address. This identifier is assigned by the ISP. However, devices that receive the signal from this source have their own local addresses. This secondary identification protocol is provided by the box or the router which must dispatch the multiple flows without ever mixing anything.

To differentiate a television connected to a tablet or a PC, the ADSL box uses Network Address Translation. This technology is only used in the private network. Indeed, from the outside, only one fixed public IP address will be visible. As such, it is important to properly secure WiFi so as not to let intruders intrude into the restricted family or professional circle.

What is the point of assigning these identifiers?

Technically, the IP address allows you to distinguish one device from another. In the Internet, this protocol establishes communication precisely. This same principle is used in a Wifi network. However, this identification is used for other purposes, notably legal and security. Indeed, law enforcement often uses IP addresses to track down cybercriminals. Companies can exploit the IP vein. They sometimes use it for advertising purposes.

That said, the IP address is personal information. It shouldn’t fall into the wrong hands. Hackers use spoofed IPs. This allows them to commit their misdeeds in the name of other Internet users who suspect nothing. Furthermore, it is easy to hide or falsify the identifier, in particular by using a VPN tunnel.

What do proxy and domain name mean?


The notion of Proxy is inseparable from the Internet protocol. This is an intermediary device whose role is to secure the connection. This device also has its own IP address. In fact, it is their identifier that is displayed in the first line when you browse the Web. Its role is to effectively preserve your anonymity. Each Internet user must activate it from the advanced settings of Mozilla or Chrome.

When a domain name is entered into the browser search bar, the DNS system translates it into an IP address. Understand that this is definitely the only way to communicate between two devices. The latter do not recognize names, but rely only on a series of 0s and 1s. In fact, the IP is transcribed into binary code to be usable by servers and remote computers, etc.