| RFC | Status | Reference | Notes |
|---|---|---|---|
| 675 | Obsolete | V. Cerf; Y. Dalal; C. Sunshine (December 1974). SPECIFICATION OF INTERNET TRANSMISSION CONTROL PROGRAM. Network Working Group. doi:10.17487/RFC0675. RFC 675. | Obsoleted by RFC 7805. NIC 2. INWG 72. |
| 698 | Obsolete | TELNET EXTENDED ASCII OPTION. IETF. July 1975. doi:10.17487/RFC0698. RFC 698. | Obsoleted by RFC 5198. NIC 32964. |
