C program to find IP address, subnet mask and default gateway

C programming language can be used to find the Internet connection details of the system. Now, let us understand the basic terminology required in this question.

IP Address - An IP address represents an Internet Protocol address. An IP address is a fixed numeric identification number associated with each device. IP addresses allow communication between devices over the Internet using IP addresses.

Subnet Mask - The 32-bit component of the IP address. A subnet mask distinguishes the network components of an IP address into the two parts of the IP address. One is the network address and the other is the network address. Subnet is the subnet number of the IP address of the system designed to connect to the network and complete the connection to the network.

Default Gateway - It is the access point or IP router of the computer connected to the network. This default gateway is the default gateway defined for the computer until an application uses a different masked gateway. The gateway is the connection route between the system network and the Internet. Failure of this network could disconnect the subnetwork from the Internet.

Now, we have learned all the statements related to our job. We can now use code snippets and programs to display these.

In the C programming language, there are two methods that can be used to check the IP address of the system.

• System Commands
• Excel Command

System Command

C Programming The language provides the system() function in the stdlib library, which can be used to access the system's IP configuration using ipconfig. When calling the function, we will pass the complete address of the ipconfig file that needs to be extracted.

Example

#include <stdio.h>
#include <stdlib.h>
int main(){
   system("c:\windows\system32\ipconfig");
   return 0;
}

Excel Command

Another way to fetch the IP details of the system is by using the excel() function. This function needs more than one parameter as in the code.

Example

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main() {
   execl("c:\windows\system32\ipconfig", "ipconfig", 0);
   return 0;
}

The output of these codes depends on the system. The system's IP details are confidential, so no output is shown here, but you can run the code and the details will be displayed on your system.

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