NSFNET T1 Usage by Service January 1992 Service Type % Packets % Bytes ============ ========= ======= File exchange 28 50 Networked mail 21 23 Interactive 15 5 Name lookup 7 4 Other TCP/UDP services 27 17 Non TCP/UDP services 2 1 --- --- 100 100 The categories above are defined as follows: File exchange ftp: data and control (tcp ports 20, 21) Networked mail smtp, nntp, vmnet, uucp (tcp ports 25, 119, 175, 540) Interactive telnet, finger, who, login (tcp ports 23, 79, 513, udp port 513) Name lookup domain name service (udp port 53, tcp port 53) Other TCP/UDP services all tcp/udp ports not included above (e.g. irc, talk, X-windows, appletalk) Non-TCP/UDP services icmp, egp, etc. More detailed information is available for anonymous FTP from NIS.NSF.NET (the Merit/NSFNET Information Services machine) in the file NSF92-01.PORTS on the NSFSTATS directory.