How Can I Retrieve My Local Computer's IP Address and Subnet Mask?

Determining Local Computer's IP Address and Subnet Mask

As computers can possess multiple IP addresses, retrieving the local computer's specific IP address proves challenging. Consider the example of a Mac system with the following assigned IP addresses:

• fe80::1%lo0
• 127.0.0.1
• ::1
• fe80::21f:5bff:fe3f:1b36%en1
• 10.0.0.138
• 172.16.175.1
• 192.168.27.1

There is no single "true" IP address; each address serves a distinct purpose. Hence, the best approach is often to request the IP address the target computer sees for your system. This ascertains the relevant IP address within the specific communication context.

However, in certain scenarios, gathering all IP addresses associated with the local machine is necessary. For Unix/macOS systems, utilize the getifaddrs() function. On Windows, employ GetAdaptersAddresses() to achieve similar functionality. For example usage, refer to the GetNetworkInterfaceInfos() function in the provided file.

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