| RFC 500: Integration of data management systems on a computer network |
| RFC 501: Un-muddling "free file transfer" |
| RFC 503: Socket number list |
| RFC 504: Distributed resources workshop announcement |
| RFC 505: Two solutions to a file transfer access problem |
| RFC 506: FTP command naming problem |
| RFC 508: Real-time data transmission on the ARPANET |
| RFC 509: Traffic statistics (April 1973) |
| RFC 510: Request for network mailbox addresses |
| RFC 511: Enterprise phone service to NIC from ARPANET sites |
| RFC 512: More on lost message detection |
| RFC 513: Comments on the new Telnet specifications |
| RFC 514: Network make-work |
| RFC 515: Specifications for datalanguage: Version 0/9 |
| RFC 516: Lost message detection |
| RFC 518: ARPANET accounts |
| RFC 519: Resource evaluation |
| RFC 520: Memo to FTP group: Proposal for File Access Protocol |
| RFC 521: Restricted use of IMP DDT |
| RFC 522: Traffic statistics (May 1973) |
| RFC 523: SURVEY is in operation again |
| RFC 524: Proposed Mail Protocol |
| RFC 525: MIT-MATHLAB meets UCSB-OLS -an example of resource sharing |
| RFC 526: Technical meeting: Digital image processing software systems |
| RFC 527: ARPAWOCKY |
| RFC 528: Software checksumming in the IMP and network reliability |
| RFC 529: Note on protocol synch sequences |
| RFC 530: Report on the Survey project |
| RFC 532: UCSD-CC Server-FTP facility |
| RFC 533: Message-ID numbers |
| RFC 534: Lost message detection |
| RFC 535: Comments on File Access Protocol |
| RFC 537: Announcement of NGG meeting July 16-17 |
| RFC 538: Traffic statistics (June 1973) |
| RFC 539: Thoughts on the mail protocol proposed in RFC 524 |
| RFC 542: File Transfer Protocol |
| RFC 543: Network journal submission and delivery |
| RFC 544: Locating on-line documentation at SRI-ARC |
| RFC 545: Of what quality be the UCSB resources evaluators? |
| RFC 546: Tenex load averages for July 1973 |
| RFC 547: Change to the Very Distant Host specification |
| RFC 548: Hosts using the IMP Going Down message |
| RFC 549: Minutes of Network Graphics Group meeting, 15-17 July 1973 |
| RFC 550: NIC NCP experiment |
| RFC 552: Single access to standard protocols |
| RFC 553: Draft design for a text/graphics protocol |
| RFC 555: Responses to critiques of the proposed mail protocol |
| RFC 556: Traffic statistics (July 1973) |
| RFC 557: Revelations in network host measurements |
| RFC 559: Comments on The New Telnet Protocol and its Implementation |
| RFC 560: Remote Controlled Transmission and Echoing Telnet option |
| RFC 561: Standardizing Network Mail Headers |
| RFC 562: Modifications to the Telnet specification |
| RFC 563: Comments on the RCTE Telnet option |
| RFC 565: Storing network survey data at the datacomputer |
| RFC 566: Traffic statistics (August 1973) |
| RFC 567: Cross Country Network Bandwidth |
| RFC 568: Response to RFC 567 - cross country network bandwidth |
| RFC 569: NETED: A Common Editor for the ARPA Network |
| RFC 571: Tenex FTP problem |
| RFC 573: Data and file transfer: Some measurement results |
| RFC 574: Announcement of a mail facility at UCSB |
| RFC 576: Proposal for modifying linking |
| RFC 577: Mail priority |
| RFC 578: Using MIT-Mathlab MACSYMA from MIT-DMS Muddle |
| RFC 579: Traffic statistics (September 1973) |
| RFC 580: Note to Protocol Designers and Implementers |
| RFC 582: Comments on RFC 580: Machine readable protocols |
| RFC 584: Charter for ARPANET Users Interest Working Group |
| RFC 585: ARPANET users interest working group meeting |
| RFC 586: Traffic statistics (October 1973) |
| RFC 587: Announcing new Telnet options |
| RFC 588: London node is now up |
| RFC 589: CCN NETRJS server messages to remote user |
| RFC 590: MULTICS address change |
| RFC 591: Addition to the Very Distant Host specifications |
| RFC 592: Some thoughts on system design to facilitate resource sharing |
| RFC 593: Telnet and FTP implementation schedule change |
| RFC 594: Speedup of Host-IMP interface |
| RFC 595: Second thoughts in defense of the Telnet Go-Ahead |
| RFC 596: Second thoughts on Telnet Go-Ahead |
| RFC 597: Host status |
| RFC 598: RFC index - December 5, 1973 |
| RFC 599: Update on NETRJS |