[RFC 600]

[RFC 601] Traffic Statistics (November 1973).

[RFC 602] "The Stockings Were Hung by the Chimney with Care".

[RFC 603] Response to RFC # 597: Host Status.

[RFC 604] Assigned Link Numbers.

[RFC 605]

• Never issued.

[RFC 606] Host Names On-line.

[RFC 607] Comments on the File Transfer Protocol.

[RFC 608] HOST NAMES ON-LINE.

[RFC 609] Statement of Upcoming Move of NIC/NLS Services.

[RFC 610] Further Datalanguage Design Concepts.

[RFC 611] TWO CHANGES T0 THE IMP/HOST PROTOCOL TO IMPROVE USER/NETWORK COMMUNICATIONS.

[RFC 612] Traffic Statistics (December 1973).

[RFC 613] Network connectivity: A response to RFC #603.

[RFC 614] Response to RFC 607, "Comments on the File Transfer Protocol".

[RFC 615] Proposed Network Standard Data Pathname Syntax.

[RFC 616]

[RFC 617] A Note on Socket Number Assignment 2.

[RFC 618] A Few Observations on NCP Statistics.

[RFC 619] Mean Round-Trip Times in the ARPANET.

[RFC 620] Request for Monitor Host Table Updates.

[RFC 621] NIC USER DIRECTORIES AT SRI-ARC.

[RFC 622] Scheduling IMP/TIP Down Time.

[RFC 623] Comments on On-Line Host Name Service.

[RFC 624] Comments on the File Transfer Protocol.

[RFC 625] ON LINE HOSTNAMES SERVICE.

[RFC 626] "On a Possible Lockup Condition in the IMP Subnet Due to Message Sequencing".

[RFC 627] ASCII TEXT FILE OF HOSTNAMES.

[RFC 628] Status of RFC Numbers and a Note on Pre-assigned Journal Numbers.

[RFC 629] SCENARIO FOR USING THE NETWORK JOURNAL.

[RFC 630] FTP Error Code Usage for More Reliable Mail Service.

[RFC 631] International Meeting on Mini-Computers and Data Communication.

[RFC 632] Throughput Degradations for Single Packet Messages.

[RFC 633] IMP/TIP Preventive Maintenance Schedule.

[RFC 634] Change in Network Address for Haskins Lab.

[RFC 635]

[RFC 636] TIP/TENEX Reliability Improvements.

[RFC 637] CHANGE OF NETWORK ADDRESS FOR SU-DSL.

[RFC 638] IMP/TIP Preventive Maintenance Schedule.

[RFC 639]

• Never issued.

[RFC 640] Revised FTP Reply Codes.

[RFC 641]

• Never issued.

[RFC 642] Ready Line Philosophy and Implementation.

[RFC 643] Network Debugging Protocol.

[RFC 644] On the Problem of Signature Authentication for Network Mail.

[RFC 645]

[RFC 646]

• Never issued.

[RFC 647]

[RFC 648]

• Never issued.

[RFC 649]

• Never issued.

[RFC 650]

• Never issued.

[RFC 651] Revised Telnet Status Option.

[RFC 652] Telnet Output Carriage-Return Disposition Option.

[RFC 653] TELNET OUTPUT HORIZONTAL TABSTOPS OPTION.

[RFC 654] TELNET OUTPUT HORIZONTAL TAB DISPOSITION OPTION.

[RFC 655] TELNET OUTPUT FORMFEED DISPOSITION OPTION.

[RFC 656] TELNET OUTPUT VERTICAL TABSTOPS OPTION.

[RFC 657] TELNET OUTPUT VERTICAL TAB DISPOSITION OPTION.

[RFC 658] TELNET OUTPUT LINEFEED DISPOSITION.

[RFC 659]

[RFC 660] SOME CHANGES TO THE IMP AND THE IMP/HOST INTERFACE.

[RFC 661]

[RFC 662] PERFORMANCE IMPROVEMENT IN ARPANET FILE TRANSFERS FROM MULTICS.

[RFC 663] A LOST MESSAGE DETECTION AND RECOVERY PROTOCOL.

[RFC 664]

• Never issued.

[RFC 665]

• Never issued.

[RFC 666]

[RFC 667]

[RFC 668]

• Never issued.

[RFC 669] November, 1974, Survey of New-Protocol TELNET Servers.

[RFC 670]

• Never issued.

[RFC 671]

[RFC 672] A Multi-Site Data Collection Facility.

[RFC 673]

• Never issued.

[RFC 674] Procedure Call Protocol Documents.

[RFC 675] SPECIFICATION OF INTERNET TRANSMISSION CONTROL PROGRAM December 1974 Version.

[RFC 676]

• Never issued.

[RFC 677] The Maintenance of Duplicate Databases.

[RFC 678] Standard File Formats.

[RFC 679]

[RFC 680]

[RFC 681] NETWORK UNIX.

[RFC 682]

• Never issued.

[RFC 683] FTPSRV - TENEX FTP EXTENSIONS FOR PAGED FILES.

[RFC 684] A Commentary on Procedure Calling as a Network Protocol.

[RFC 685] Response Time in Cross-network Debugging.

[RFC 686] Leaving Well Enough Alone.

[RFC 687] IMP/Host and Host/IMP Protocol Change.

[RFC 688] Tentative Schedule for the New TELNET Implementation for the TIP.

[RFC 689] TENEX NCP Finite State Machine for connections TENEX Memo Number 155.

[RFC 690] Comments on the proposed Host/IMP Protocol Change.

[RFC 691] One More Try on the FTP.

[RFC 692] COMMENTS ON IMP/HOST PROTOCOL CHANGES, (RFCS 687 AND 690).

[RFC 693]

• Never issued.

[RFC 694]

[RFC 695] Official Change in Host-Host Protocol.

[RFC 696]

[RFC 697] CWD Command of FTP.

[RFC 698] TELNET EXTENDED ASCII OPTION.

[RFC 699] Requests For Comments Summary Notes: 600-699.