| RFC 0601: Traffic Statistics (November 1973). A.M. McKenzie. December 1973. | |
| RFC 0602: "The Stockings Were Hung by the Chimney With Care". R.M. Metcalfe. December 1973. | |
| RFC 0603: Response to RFC 597: Host Status. J.D. Burchfiel. December 1973. | |
| RFC 0604: Assigned Link Numbers. J. Postel. December 1973. | |
| RFC 0606: Host Names On-Line. L.P. Deutsch. December 1973. | |
| RFC 0607: Comments on the File Transfer Protocol. M. Krilanovich, G. Gregg. January 1974. | |
| RFC 0608: Host Names On-Line. M.D. Kudlick. January 1974. | |
| RFC 0609: Statement of Upcoming Move of NIC/NLS Service. B. Ferguson. January 1974. | |
| RFC 0610: Further Datalanguage Design Concepts. R. Winter, J. Hill, W. Greiff. December 1973. | |
| RFC 0611: Two Changes to the IMP/Host Protocol to Improve User/Network Communications. D.C. Walden. February 1974. | |
| RFC 0612: Traffic Statistics (December 1973). A.M. McKenzie. January 1974. | |
| RFC 0613: Network Connectivity: A Response to RFC 603. A.M. McKenzie. January 1974. | |
| RFC 0614: Response to RFC 607: "Comments on the File Transfer Protocol". K.T. Pogran, N. Neigus. January 1974. | |
| RFC 0615: Proposed Network Standard Data Pathname Syntax. D. Crocker. March 1974. | |
| RFC 0617: Note on Socket Number Assignment. E.A. Taft. February 1974. | |
| RFC 0618: Few Observations on NCP Statistics. E.A. Taft. February 1974. | |
| RFC 0619: Mean Round-Trip Times in the ARPANET. W. Naylor, H. Opderbeck. March 1974. | |
| RFC 0620: Request for Monitor Host Table Updates. B. Ferguson. March 1974. | |
| RFC 0621: NIC User Directories at SRI ARC. M.D. Kudlick. March 1974. | |
| RFC 0622: Scheduling IMP/TIP Down Time. A.M. McKenzie. March 1974. | |
| RFC 0623: Comments on On-Line Host Name Service. M. Krilanovich. February 1974. | |
| RFC 0624: Comments on the File Transfer Protocol. M. Krilanovich, G. Gregg, W. Hathaway, et al. February 1974. | |
| RFC 0625: On-Line Hostnames Service. M.D. Kudlick, E.J. Feinler. March 1974. | |
| RFC 0626: On a Possible Lockup Condition in IMP Subnet Due to Message Sequencing. L. Kleinrock, H. Opderbeck. March 1974. | |
| RFC 0627: ASCII Text File of Hostnames. M.D. Kudlick, E.J. Feinler. March 1974. | |
| RFC 0628: Status of RFC Numbers and a Note on Pre-Assigned Journal Numbers. M.L. Keeney. March 1974. | |
| RFC 0629: Scenario for Using the Network Journal. J.B. North. March 1974. | |
| RFC 0630: FTP Error Code Usage for More Reliable Mail Service. J. Sussmann. April 1974. | |
| RFC 0631: International Meeting on Minicomputers and Data Communication: Call for Papers. A. Danthine. April 1974. | |
| RFC 0632: Throughput Degradations for Single Packet Messages. H. Opderbeck. May 1974. | |
| RFC 0633: IMP/TIP Preventive Maintenance Schedule. A.M. McKenzie. March 1974. | |
| RFC 0634: Change in Network Address for Haskins Lab. A.M. McKenzie. April 1974. | |
| RFC 0636: TIP/Tenex Reliability Improvements. J.D. Burchfiel, B. Cosell, R.S. Tomlinson, et al. June 1974. | |
| RFC 0637: Change of Network Address for SU-DSL. A.M. McKenzie. April 1974. | |
| RFC 0638: IMP/TIP Preventive Maintenance Schedule. A.M. McKenzie. April 1974. | |
| RFC 0640: Revised FTP Reply Codes. J. Postel. June 1974. | |
| RFC 0642: Ready Line Philosophy and Implementation. J.D. Burchfiel. July 1974. | |
| RFC 0643: Network Debugging Protocol. E. Mader. July 1974. | |
| RFC 0644: On the Problem of Signature Authentication for Network Mail. R. Thomas. July 1974. | |
| RFC 0651: Revised Telnet Status Option. D. Crocker. October 1974. | |
| RFC 0652: Telnet Output Carriage-Return Disposition Option. D. Crocker. October 1974. | |
| RFC 0653: Telnet Output Horizontal Tabstops Option. D. Crocker. October 1974. | |
| RFC 0654: Telnet Output Horizontal Tab Disposition Option. D. Crocker. October 1974. | |
| RFC 0655: Telnet Output Formfeed Disposition Option. D. Crocker. October 1974. | |
| RFC 0656: Telnet Output Vertical Tabstops Option. D. Crocker. October 1974. | |
| RFC 0657: Telnet Output Vertical Tab Disposition Option. D. Crocker. October 1974. | |
| RFC 0658: Telnet Output Linefeed Disposition. D. Crocker. October 1974. | |
| RFC 0660: Some Changes to the IMP and the IMP/Host Interface. D.C. Walden. October 1974. | |
| RFC 0662: Performance Improvement in ARPANET File Transfers from Multics. R. Kanodia. November 1974. | |
| RFC 0663: Lost Message Detection and Recovery Protocol. R. Kanodia. November 1974. | |
| RFC 0669: November, 1974, Survey of New-Protocol Telnet Servers. D.W. Dodds. December 1974. | |
| RFC 0672: Multi-Site Data Collection Facility. R. Schantz. December 1974. | |
| RFC 0674: Procedure Call Documents: Version 2. J. Postel, J.E. White. December 1974. | |
| RFC 0675: Specification of Internet Transmission Control Program. V. Cerf, Y. Dalal, C. Sunshine. December 1974. | |
| RFC 0677: Maintenance of Duplicate Databases. P.R. Johnson, R. Thomas. January 1975. | |
| RFC 0678: Standard File Formats. J. Postel. December 1974. | |
| RFC 0681: Network UNIX. S. Holmgren. March 1975. | |
| RFC 0683: FTPSRV - Tenex Extension for Paged Files. R. Clements. April 1975. | |
| RFC 0684: Commentary on Procedure Calling as a Network Protocol. R. Schantz. April 1975. | |
| RFC 0685: Response Time in Cross Network Debugging. M. Beeler. April 1975. | |
| RFC 0686: Leaving Well Enough Alone. B. Harvey. May 1975. | |
| RFC 0687: IMP/Host and Host/IMP Protocol Changes. D.C. Walden. June 1975. | |
| RFC 0688: Tentative Schedule for the New Telnet Implementation for the TIP. D.C. Walden. June 1975. | |
| RFC 0689: Tenex NCP Finite State Machine for Connections. R. Clements. May 1975. | |
| RFC 0690: Comments on the Proposed Host/IMP Protocol Changes. J. Postel. June 1975. | |
| RFC 0691: One More Try on the FTP. B. Harvey. June 1975. | |
| RFC 0692: Comments on IMP/Host Protocol Changes (RFCs 687 and 690). S.M. Wolfe. June 1975. | |
| RFC 0695: Official Change in Host-Host Protocol. M. Krilanovich. July 1975. | |
| RFC 0697: CWD Command of FTP. J. Lieb. July 1975. | |
| RFC 0698: Telnet Extended ASCII Option. T. Mock. July 1975. | |
| RFC 0699: Request For Comments Summary Notes: 600-699. J. Postel, J. Vernon. November 1982. | |
| RFC 0700: Protocol Experiment. E. Mader, W.W. Plummer, R.S. Tomlinson. August 1974. |
|