Network Working Group J. Reynolds Request for Comments: 1700 J ...

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RFC 1700 Assigned Numbers October 1994MILNET LINK NUMBERSThe word "link" here refers to a field in the original MILNET Host/IMPinterface leader. The link was originally defined as an 8-bit field.Later specifications defined this field as the "message-id" with alength of 12 bits. The name link now refers to the high order 8 bits ofthis 12-bit message-id field. The Host/IMP interface is defined in BBNReport 1822 [BBN1822].The low-order 4 bits of the message-id field are called the sub-link.Unless explicitly specified otherwise for a particular protocol, thereis no sender to receiver significance to the sub-link. The sender mayuse the sub-link in any way he chooses (it is returned in the RFNM bythe destination IMP), the receiver should ignore the sub-link.Link Assignments:Decimal Description References------- ----------- ----------0-63 BBNCC Monitoring [MB]64-149 Unassigned [JBP]150 Xerox NS IDP [ETHERNET,XEROX]151 Unassigned [JBP]152 PARC Universal Protocol [PUP,XEROX]153 TIP Status Reporting [JGH]154 TIP Accounting [JGH]155 Internet Protocol [regular] [RFC791,JBP]156-158 Internet Protocol [experimental] [RFC791,JBP]159 Figleaf Link [JBW1]160 Blacker Local Network Protocol [DM28]161-194 Unassigned [JBP]195 ISO-IP [RFC926,RXM]196-247 Experimental Protocols [JBP]248-255 Network Maintenance [JGH]MILNET LOGICAL ADDRESSESThe MILNET facility for "logical addressing" is described in [RFC878]and [RFC1005]. A portion of the possible logical addresses arereserved for standard uses.There are 49,152 possible logical host addresses. Of these, 256 arereserved for assignment to well-known functions. Assignments forwell-known functions are made by the IANA. Assignments for otherReynolds & Postel [Page 186]
RFC 1700 Assigned Numbers October 1994logical host addresses are made by the NIC.Logical Address Assignments:Decimal Description References------- ----------- ----------0 Reserved [JBP]1 The BBN Core Gateways [MB]2-254 Unassigned [JBP]255 Reserved [JBP]MILNET X.25 ADDRESS MAPPINGSAll MILNET hosts are assigned addresses by the Defense Data Network(DDN). The address of a MILNET host may be obtained from the NetworkInformation Center (NIC), represented as an ASCII text string in whatis called "host table format". This section describes the process bywhich MILNET X.25 addresses may be derived from addresses in the NIChost table format.A NIC host table address consists of the ASCII text stringrepresentations of four decimal numbers separated by periods,corresponding to the four octeted of a thirty-two bit Internetaddress. The four decimal numbers are referred to in this section as"n", "h’ "l", and "i". Thus, a host table address may be representedas: "n.h.l.i". Each of these four numbers will have either one, two,or three decimal digits and will never have a value greater than 255.For example, in the host table, address: "10.2.0.124", n=10, h=2, l=0,and i=124. To convert a host table address to a MILNET X.25 address:1. If h < 64, the host table address corresponds to the X.25physical address:ZZZZ F IIIHHZZ (SS)where:ZZZZ = 0000F = 0IIIas requiredbecause the address is a physical address;is a three decimal digit respresentation of"i", right-adjusted and padded with leadingReynolds & Postel [Page 187]
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