IP->Com is a freeware program to share all/any your COM ports remotely over your local network or the Internet, simultaneously.
It allows any of the existing serial (RS232) ports on your PC to interface directly to a TCP/IP network. This makes it possible for any other computer on the same network to send and receive serial data through a remote serial port on the PC where IP->Com is running. You connect to the remote serial port by connecting to a TCP/IP port.
To use IP->Com, simply select the COM port, configure it, and then select which interface address/port to bind it to. From there, you press Enable and you are done. These steps are repeated for any other COM ports up to COM32.