RFC 604 Assigned Link Numbers December 1973 Reserved Link 1, and links 72-154 are reserved for future developments and experiments and currently are not to be used. Table: Link Number Assignment 0 Control Link 1 Reserved 2-71 Connections 72-154 Reserved 155-158 Internetworking Protocol 159-191 Measurements 192-195 Message Switching Protocol 196-255 Experimental References: Host-to-host Protocol NIC 8246 Internetworking Protocol NIC 18764 Message Switching Protocol NIC 9926 [ This RFC was put into machine readable form for entry ] [ into the online RFC archives by Alex McKenzie with ] [ support from GTE, formerly BBN Corp. 10/99 ] Postel