RFC 1 - 20
| RFC-1 | Host Software |
| RFC-2 | Host software |
| RFC-3 | Documentation conventions (Obsoleted by RFC-10 -> RFC-16 -> RFC-24) |
| RFC-4 | Network timetable |
| RFC-5 | Decode Encode Language (DEL) |
| RFC-6 | Conversation with Bob Kahn |
| RFC-7 | Host-IMP interface |
| RFC-8 | Functional specifications for the ARPA Network |
| RFC-9 | Host software |
| RFC-10 | Documentation conventions (Obsoleted by RFC-16 -> RFC-24) (Updated by RFC-24, RFC-27, RFC-30) |
| RFC-11 | Implementation of the Host-Host software procedures in GORDO (Obsoleted by RFC-33) |
| RFC-12 | IMP-Host interface flow diagrams |
| RFC-13 | Zero Text Length EOF Message |
| RFC-14 | Not Issued |
| RFC-15 | Network subsystem for time sharing hosts |
| RFC-16 | M.I.T (Obsoleted by RFC-24) (Updated by RFC-24, RFC-27, RFC-30) |
| RFC-17 | Some questions re: Host-IMP Protocol |
| RFC-18 | IMP-IMP and HOST-HOST Control Links |
| RFC-19 | Two protocol suggestions to reduce congestion at swap bound nodes |
| RFC-20 | ASCII format for network interchange |