FindLoopbackIPv4Interface finds the IPv4 loopback interface.

FindPublicIPv4 returns the public IPv4 address of the computer.

FreeTCPPort returns a free TCP port by using net.ListenTCP on port :0.

FreeUDPPort returns a free UDP port by using net.ListenUDP on port :0.

IsLoopbackAddress returns true if the listen address (host:port) points at a loopback address.

PortOfHostPort returns the port number for the host:port string.

RandomLocalEndpoint returns a random endpoint on the loppback interface.

RandomPublicEndpoint returns a random public endpoint on the host.

ServiceHostPort returns the listener address as a host:port string.