RFC 433 Socket Number List 22 December 1972 We will be pleased to include socket/function information for other than "offical" sockets [e.g Tip News]. 1 UCLA-NMC 1 Telnet 241 NCP Measurement 243 Survey Data 2 SRI-ARC 1 Telnet 3 File Transfer 5 Echo 7 CPYNET 9 SYSTAT 13 DATE-TIME 3 UCSB 1 Telnet 5 UCSB RJS [not ARPANET standard] 7 Echo 9 Discard 4 UTAH 1 Telnet 3 File Transfer 5 Echo 7 CPYNET 9 SYSTAT 13 DATE-TIME 5 NCC 6 MIT-Multics 1 Telnet 9 Harvard 1 Telnet 3 Sorry File Transfer 10 LL-67 1 Telnet 11 SAIL 1 Telnet 3 File Transfer 12 ILL-ANTS 13 CASE 1 Telnet 3 File Transfer 5 Echo 7 CPYNET 9 SYSTAT 13 DATE-TIME 14 CMU 1 Telnet 3 File Transfer 15 ILLIAC-TENEX 1 Telnet 3 File Transfer Postel and Neigus