Ports and Connections

what if we (Internet-Assigned-Numbers-Authority) hijacked the first 1024 ports

that's exactly what IANA did. the list can be found here it lists the commonly (almost universal) ports that are reserved for use by the device/OS itself the rest of the ports (1025-65535) are used for private or dynamic use by applications.

Sockets

Sockets are ephemeral ports bound to the source IP address, reserved for temporary use by an application. Only one application can use a socket at any one time. A socket is composed of the source IP address and port that points to the destination IP address and port (the ports don't have to match).