MIT TCP/IP for MS-DOS.
Works best with a 3com 3c501 card.
Be sure to load the device driver in your config.sys "DEVICE=\NETDEV.SYS"
However you configure your tcpip settings using the custom program. It uses octal, so have a calculator handy, and remembering 255 is 377
This stack predates DNS, I'd only tested the ping & telnet, using 86box.
More notes here: https://virtuallyfun.com/2024/03/21/building-mit-pc-ip-or-making-apple-pie/