MSDN - Windows API Reference

Networking APIs

WinSock

Low‑level sockets API for TCP, UDP, and raw network communication on Windows.

HttpClient

Modern HTTP client for sending asynchronous requests and handling responses.

WebClient

Simple wrapper for downloading/uploading data over HTTP and FTP.

NetworkInformation

Provides details about network adapters, interfaces, and connectivity status.

Sockets2

Extended sockets API supporting IPv6, socket options, and advanced features.

IPHelper

Functions for retrieving IP address tables, routing information, and network statistics.