mTCP v2023-03-31 by Michael B. Brutman is a set of TCP/IP applications for personal computers running PC-DOS, MS-DOS, FreeDOS, and other flavors of DOS. mTCP needs a 8088 processor (or +), 96 to 256 Kb of system memory depending on the application, ms-dos v2.1 (or +) and a network card (Ethernet adapter, or a device emulating Ethernet) that has a packet driver.

If you go on the mTCP web page, you must know that it's a 39 years old PC Jr which is running mTCP own http server.