As of v4r1:
http://publib.boulder.ibm.com/pubs/pdfs/as400/V4R1PDF/QB3ANL00.pdf
For V4R1 the OS/400 operating system contains the following:
- The TCP/IP protocol stack
- The configuration support for the TCP/IP protocol stack
- Serial Line Internet Protocol (SLIP)
- These applications and their associated CL commands:
 – Network status (NETSTAT)
 – Packet InterNet Groper (PING)
 – SNMP v1 agent
 – Bootstrap Protocol (BOOTP)
 – Route Daemon (RouteD)
 – Trivial File Transfer Protocol (TFTP)
- The capability to run APPC applications over TCP/IP
- The capability to run the Internet Protocol over
- AnyNet using the sockets API, including the IBM-supplied
applications that are written to the sockets API (For example, SMTP,
FTP, LPR, and LPD).
- The C sockets API
- Selected input/output processors are available that have TCP/IP
assist functions to help improve TCP/IP throughput and performance.
For V4R1 the TCP/IP Utilities licensed program contains the following:
- The Send MIME Mail (QtmmSendMail) API
- The Pascal TCP and UDP API
- These applications and their associated CL  commands:
 – TELNET
 – Simple Mail Transfer Protocol (SMTP)
 – File Transfer Protocol (FTP)
 – Line printer requester (LPR)
 – Line printer daemon (LPD)
 – Remote Execution (REXEC)
 – Post Office Protocol (POP) Version 3 mail server
 – Internet Connection Server (ICS) (previ-ously known as the World
Wide Web Hypertext Transfer Protocol (HTTP) server)
 – 5250/Hypertext Markup Language (HTML)
- workstation gateway (WSG)
HTH,
Charles
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