Devices also have a subnet mask, which defines which part of the IP address belongs to the network and which part belongs to the device.

The Subnet Mask is used by the network to determine which group of IP addresses the device belongs. The Domain Name Service is a group of servers that translate URLs into IP addresses.

The second part of a TCP/IP address that defines the subnetwork in which the device resides. The subnet ID number is shared with the host ID. See subnet mask and subnet mask tables.

Is there an easy way (like via a .Net library) that allows me to get the IP address and subnet mask of the local machine that the application is running on?

Knowing the local (or private) and external (or public) IP addresses for your devices can help you keep your network running smoothly and safely.