IpAddr models both IPv4 and IPv6 numeric addresses as well as provide DNS hostname resolution

Network interface which models name and IP addresses assigned

MulticastSocket extends UdpSocket to provide multicast capabilities

Configuration options for TCP and UDP sockets

SocketOptions groups together all the socket options used to tune a TcpSocket, TcpListener, or UdpSocket

TcpListener is a server socket that listens to a local well known port for incoming TcpSockets

TcpSocket manages a TCP/IP endpoint

UdpPacket encapsulates an IpAddr, port, and payload of bytes to send or receive from a UdpSocket

UdpSocket manages a UDP/IP datagram endpoint

UnknownHostErr indicates a failure to resolve a hostname to an IP address