| QAbstractSocket | The base functionality common to all socket types |
| QFtp | Implementation of the FTP protocol |
| QHostAddress | IP address |
| QHostInfo | Static functions for host name lookups |
| QHttp | Implementation of the HTTP protocol |
| QHttpHeader | Header information for HTTP |
| QHttpRequestHeader | Request header information for HTTP |
| QHttpResponseHeader | Response header information for HTTP |
| QTcpServer | TCP-based server |
| QTcpSocket | TCP socket |
| QUdpSocket | UDP socket |
| QUrlInfo | Stores information about URLs |