RFC

The Telnet protocol is defined by several RFC’s.

This page lists all RFC’s dealing with the Telnet protocol and its extensions (such as IBM TN3270, IBM TN5250, KERBEROS authentication and more):

The main ones are RFC854-RFC861, and especially STD8 – RFC854 and RFC855.

Here are the main ones, in chronological order:

• RFC 97, First Cut at a Proposed Telnet Protocol (1971), not available online
• RFC 764, Telnet Protocol Specification (1980), obsolete (replaced by RFC 854)
• RFC 854, Telnet Protocol Specification (1983)
• RFC 855, Telnet Option Specifications (1983)
• The SSH (Secure Shell) Remote Login Protocol (1995)