Telnet Protocol Reference

This page contains technical information about the Telnet protocol.

Telnet-Related RFC Documents

  RFC Number Description Date Replaces Replaced By Updates
View 652 Telnet output carriage-return disposition option 1974      
View 653 Telnet output horizontal tabstops option 1974      
View 654 Telnet output horizontal tab disposition option 1974      
View 655 Telnet output formfeed disposition option 1974      
View 656 Telnet output vertical tabstops option 1974      
View 657 Telnet output vertical tab disposition option 1974      
View 658 Telnet output linefeed disposition 1974      
View 659 Announcing additional Telnet options 1974      
View 698 Telnet extended ASCII option 1975      
View 727 Telnet logout option 1977      
View 735 Revised Telnet byte macro option 1977 RFC 729    
View 748 Telnet randomly-lose option 1978      
View 779 Telnet send-location option 1981      
View 854 Telnet Protocol Specification 1983 NIC 18639    
View 855 Telnet Option Specifications 1983 NIC 18640    
View 856 Telnet Binary Transmission 1983 NIC 15389    
View 857 Telnet Echo Option 1983 NIC 15390    
View 858 Telnet Suppress Go Ahead Option 1983 NIC 15392    
View 859 Telnet Status Option 1983 RFC 651 (NIC 31154)    
View 860 Telnet Timing Mark Option 1983 NIC 16238    
View 861 Telnet Extended Options -- List Option 1983 NIC 16239    
View 884 Telnet Terminal Type Option 1983   RFC 930  
View 885 Telnet End of Record Option 1983      
View 927 TACAS User Identification Telnet Option 1984      
View 930 Telnet Terminal Type Option 1985 RFC 884 RFC 1091  
View 933 Output Marking Telnet Option 1985      
View 946 Telnet terminal location number option 1985      
View 1041 Telnet 3270 Regime Option 1988      
View 1043 Telnet Data Entry Terminal option: DODIIS Implementation 1988     RFC 732
View 1053 Telnet X.3 PAD option 1988      
View 1073 Telnet Window Size Option 1988      
View 1079 Telnet Terminal Speed Option 1988      
View 1080 Telnet Remote Flow Control Option 1988   RFC 1372  
View 1091 Telnet Terminal-Type Option 1989 RFC 930    
View 1096 Telnet X Display Location Option 1989      
View 1097 Telnet subliminal-message option 1989      
View 1116 Telnet Linemode Option 1989   RFC 1184  
View 1143 The Q Method of Implementing TELNET Option Negotiation 1990      
View 1184 Telnet Linemode Option 1990 RFC 1116    
View 1205 5250 Telnet Interface 1991      
View 1372 Telnet Remote Flow Control Option 1992 RFC 1080    
View 1408 Telnet Environment Option 1993      
View 1409 Telnet Authentication Option 1993   RFC 1416  
View 1411 Telnet Authentication: Kerberos Version 4 1993      
View 1412 Telnet Authentication: SPX 1993      
View 1416 Telnet Authentication Option 1993 RFC 1409 RFC 2941  
View 1571 Telnet Environment Option Interoperability Issues 1994     RFC 1408
View 1572 Telnet Environment Option 1994      
View 1576 TN3270 Current Practices 1994      
View 1646 TN3270 Extensions for LUname and Printer Selection 1994      
View 1647 TN3270 Enhancements 1994   RFC 2355  
View 2066 Telnet CHARSET Option 1997      
View 2217 Telnet Com Port Control Option 1997      
View 2355 TN3270 Enhancements 1998 RFC 1647    
View 2840 Telnet Kermit Option 2000      
View 2877 5250 Enhancements 2000   RFC 4777 RFC 1205
View 2941 Telnet Authentication Option 2000 RFC 1416    
View 2942 Telnet Authentication: Kerberos Version 5 2000      
View 2943 Telnet Authentication Using DSA 2000      
View 2944 Telnet Authentication: SRP 2000      
View 2946 Telnet Data Encryption Option 2000      
View 2947 Telnet Encryption: DES3 64 bit Cipher Feedback 2000      
View 2948 Telnet Encryption: DES3 64 bit Output Feedback 2000      
View 2949 Telnet Encryption: CAST-128 64 bit Output Feedback 2000      
View 2950 Telnet Encryption: CAST-128 64 bit Cipher Feedback 2000      
View 2951 Telnet Authentication Using KEA and SKIPJACK 2000      
View 2952 Telnet Encryption: DES 64 bit Cipher Feedback 2000      
View 2953 Telnet Encryption: DES 64 bit Output Feedback 2000      
View 4248 The telnet URI scheme 2005 RFC 1738    
View 4777 IBM's iSeries Telnet Enhancements 2006 RFC 2877    

Option Codes

See Telnet Option List.