341 lines
12 KiB
Plaintext
341 lines
12 KiB
Plaintext
Network Working Group K. Harrenstien (SRI)
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Request for Comments: 952 M. Stahl (SRI)
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E. Feinler (SRI)
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Obsoletes: RFC 810, 608 October 1985
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DOD INTERNET HOST TABLE SPECIFICATION
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STATUS OF THIS MEMO
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This RFC is the official specification of the format of the Internet
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Host Table. This edition of the specification includes minor
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revisions to RFC-810 which brings it up to date. Distribution of this
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memo is unlimited.
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INTRODUCTION
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The DoD Host Table is utilized by the DoD Hostname Server maintained
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by the DDN Network Information Center (NIC) on behalf of the Defense
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Communications Agency (DCA) [See RFC-953].
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LOCATION OF THE STANDARD DOD ONLINE HOST TABLE
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A machine-translatable ASCII text version of the DoD Host Table is
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online in the file NETINFO:HOSTS.TXT on the SRI-NIC host. It can be
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obtained via FTP from your local host by connecting to host
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SRI-NIC.ARPA (26.0.0.73 or 10.0.0.51), logging in as user =
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ANONYMOUS, password = GUEST, and retrieving the file
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"NETINFO:HOSTS.TXT". The same table may also be obtained via the NIC
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Hostname Server, as described in RFC-953. The latter method is
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faster and easier, but requires a user program to make the necessary
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connection to the Name Server.
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ASSUMPTIONS
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1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
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to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
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sign (-), and period (.). Note that periods are only allowed when
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they serve to delimit components of "domain style names". (See
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RFC-921, "Domain Name System Implementation Schedule", for
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background). No blank or space characters are permitted as part of a
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name. No distinction is made between upper and lower case. The first
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character must be an alpha character. The last character must not be
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a minus sign or period. A host which serves as a GATEWAY should have
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"-GATEWAY" or "-GW" as part of its name. Hosts which do not serve as
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Internet gateways should not use "-GATEWAY" and "-GW" as part of
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their names. A host which is a TAC should have "-TAC" as the last
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part of its host name, if it is a DoD host. Single character names
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or nicknames are not allowed.
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2. Internet Addresses are 32-bit addresses [See RFC-796]. In the
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Harrenstien & Stahl & Feinler [Page 1]
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RFC 952 October 1985
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DOD INTERNET HOST TABLE SPECIFICATION
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host table described herein each address is represented by four
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decimal numbers separated by a period. Each decimal number
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represents 1 octet.
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3. If the first bit of the first octet of the address is 0 (zero),
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then the next 7 bits of the first octet indicate the network number
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(Class A Address). If the first two bits are 1,0 (one,zero), then
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the next 14 bits define the net number (Class B Address). If the
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first 3 bits are 1,1,0 (one,one,zero), then the next 21 bits define
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the net number (Class C Address) [See RFC-943].
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This is depicted in the following diagram:
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+-+------------+--------------+--------------+--------------+
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|0| NET <-7-> | LOCAL ADDRESS <-24-> |
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+-+------------+--------------+--------------+--------------+
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+---+----------+--------------+--------------+--------------+
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|1 0| NET <-14-> | LOCAL ADDRESS <-16-> |
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+---+----------+--------------+--------------+--------------+
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+-----+--------+--------------+--------------+--------------+
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|1 1 0| NET <-21-> | LOCAL ADDRESS|
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+-----+--------+--------------+--------------+--------------+
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4. The LOCAL ADDRESS portion of the internet address identifies a
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host within the network specified by the NET portion of the address.
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5. The ARPANET and MILNET are both Class A networks. The NET portion
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is 10 decimal for ARPANET, 26 decimal for MILNET, and the LOCAL
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ADDRESS maps as follows: the second octet identifies the physical
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host, the third octet identifies the logical host, and the fourth
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identifies the Packet Switching Node (PSN), formerly known as an
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Interface Message Processor (IMP).
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+-+------------+--------------+--------------+--------------+
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|0| 10 or 26 | HOST | LOGICAL HOST | PSN (IMP) |
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+-+------------+--------------+--------------+--------------+
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(NOTE: RFC-796 also describes the local address mappings for
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several other networks.)
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6. It is the responsibility of the users of this host table to
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translate it into whatever format is needed for their purposes.
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7. Names and addresses for DoD hosts and gateways will be negotiated
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and registered with the DDN PMO, and subsequently with the NIC,
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Harrenstien & Stahl & Feinler [Page 2]
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RFC 952 October 1985
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DOD INTERNET HOST TABLE SPECIFICATION
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before being used and before traffic is passed by a DoD host. Names
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and addresses for domains and networks are to be registered with the
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DDN Network Information Center (HOSTMASTER@SRI-NIC.ARPA) or
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800-235-3155.
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The NIC will attempt to keep similar information for non-DoD networks
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and hosts, if this information is provided, and as long as it is
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needed, i.e., until intercommunicating network name servers are in
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place.
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EXAMPLE OF HOST TABLE FORMAT
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NET : 10.0.0.0 : ARPANET :
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NET : 128.10.0.0 : PURDUE-CS-NET :
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GATEWAY : 10.0.0.77, 18.10.0.4 : MIT-GW.ARPA,MIT-GATEWAY : PDP-11 :
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MOS : IP/GW,EGP :
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HOST : 26.0.0.73, 10.0.0.51 : SRI-NIC.ARPA,SRI-NIC,NIC : DEC-2060 :
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TOPS20 :TCP/TELNET,TCP/SMTP,TCP/TIME,TCP/FTP,TCP/ECHO,ICMP :
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HOST : 10.2.0.11 : SU-TAC.ARPA,SU-TAC : C/30 : TAC : TCP :
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SYNTAX AND CONVENTIONS
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; (semicolon) is used to denote the beginning of a comment.
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Any text on a given line following a ';' is a
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comment, and not part of the host table.
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NET keyword introducing a network entry
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GATEWAY keyword introducing a gateway entry
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HOST keyword introducing a host entry
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DOMAIN keyword introducing a domain entry
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:(colon) is used as a field delimiter
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::(2 colons) indicates a null field
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,(comma) is used as a data element delimiter
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XXX/YYY indicates protocol information of the type
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TRANSPORT/SERVICE.
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where TRANSPORT/SERVICE options are specified as
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"FOO/BAR" both transport and service known
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Harrenstien & Stahl & Feinler [Page 3]
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RFC 952 October 1985
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DOD INTERNET HOST TABLE SPECIFICATION
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"FOO" transport known; services not known
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"BAR" service is known, transport not known
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NOTE: See "Assigned Numbers" for specific options and acronyms
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for machine types, operating systems, and protocol/services.
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Each host table entry is an ASCII text string comprised of 6 fields,
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where
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Field 1 KEYWORD indicating whether this entry pertains to
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a NET, GATEWAY, HOST, or DOMAIN. NET entries are
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assigned and cannot have alternate addresses or
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nicknames. DOMAIN entries do not use fields 4, 5,
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or 6.
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Field 2 Internet Address of Network, Gateway, or Host
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followed by alternate addresses. Addresses for a
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Domain are those where a Domain Name Server exists
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for that domain.
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Field 3 Official Name of Network, Gateway, Host, or Domain
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(with optional nicknames, where permitted).
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Field 4 Machine Type
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Field 5 Operating System
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Field 6 Protocol List
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Fields 4, 5 and 6 are optional. For a Domain they are not used.
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Fields 3-6, if included, pertain to the first address in Field 2.
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'Blanks' (spaces and tabs) are ignored between data elements or
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fields, but are disallowed within a data element.
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Each entry ends with a colon.
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The entries in the table are grouped by types in the order Domain,
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Net, Gateway, and Host. Within each type the ordering is
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unspecified.
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Note that although optional nicknames are allowed for hosts, they are
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discouraged, except in the case where host names have been changed
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Harrenstien & Stahl & Feinler [Page 4]
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RFC 952 October 1985
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DOD INTERNET HOST TABLE SPECIFICATION
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and both the new and the old names are maintained for a suitable
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period of time to effect a smooth transition. Nicknames are not
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permitted for NET names.
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GRAMMATICAL HOST TABLE SPECIFICATION
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A. Parsing grammar
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<entry> ::= <keyword> ":" <addresses> ":" <names> [":" [<cputype>]
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[":" [<opsys>] [":" [<protocol list>] ]]] ":"
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<addresses> ::= <address> *["," <address>]
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<address> ::= <octet> "." <octet> "." <octet> "." <octet>
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<octet> ::= <0 to 255 decimal>
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<names> ::= <netname> | <gatename> | <domainname> *[","
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<nicknames>]
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| <official hostname> *["," <nicknames>]
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<netname> ::= <name>
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<gatename> ::= <hname>
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<domainname> ::= <hname>
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<official hostname> ::= <hname>
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<nickname> ::= <hname>
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<protocol list> ::= <protocol spec> *["," <protocol spec>]
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<protocol spec> ::= <transport name> "/" <service name>
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| <raw protocol name>
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B. Lexical grammar
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<entry-field> ::= <entry-text> [<cr><lf> <blank> <entry-field>]
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<entry-text> ::= <print-char> *<text>
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<blank> ::= <space-or-tab> [<blank>]
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<keyword> ::= NET | GATEWAY | HOST | DOMAIN
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<hname> ::= <name>*["."<name>]
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<name> ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]
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<cputype> ::= PDP-11/70 | DEC-1080 | C/30 | CDC-6400...etc.
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<opsys> ::= ITS | MULTICS | TOPS20 | UNIX...etc.
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<transport name> ::= TCP | NCP | UDP | IP...etc.
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<service name> ::= TELNET | FTP | SMTP | MTP...etc.
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<raw protocol name> ::= <name>
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<comment> ::= ";" <text><cr><lf>
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<text> ::= *[<print-char> | <blank>]
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<print-char> ::= <any printing char (not space or tab)>
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Notes:
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1. Zero or more 'blanks' between separators " , : " are allowed.
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'Blanks' are spaces and tabs.
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Harrenstien & Stahl & Feinler [Page 5]
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RFC 952 October 1985
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DOD INTERNET HOST TABLE SPECIFICATION
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2. Continuation lines are lines that begin with at least one
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blank. They may be used anywhere 'blanks' are legal to split an
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entry across lines.
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BIBLIOGRAPHY
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1. Feinler, E., Harrenstien, K., Su, Z. and White, V., "Official DoD
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Internet Host Table Specification", RFC-810, Network Information
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Center, SRI International, March 1982.
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2. Harrenstien, K., Stahl, M., and Feinler, E., "Hostname Server",
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RFC-953, Network Information Center, SRI International, October
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1985.
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3. Kudlick, M. "Host Names Online", RFC-608, Network Information
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Center, SRI International, January 1973.
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4. Postel, J., "Internet Protocol", RFC-791, Information Sciences
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Institute, University of Southern California, Marina del Rey,
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September 1981.
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5. Postel, J., "Address Mappings", RFC-796, Information Sciences
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Institute, University of Southern California, Marina del Rey,
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September 1981.
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6. Postel, J., "Domain Name System Implementation Schedule", RFC-921,
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Information Sciences Institute, University of Southern California,
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Marina del Rey, October 1984.
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7. Reynolds, J. and Postel, J., "Assigned Numbers", RFC-943,
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Information Sciences Institute, University of Southern California,
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Marina del Rey, April 1985.
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Harrenstien & Stahl & Feinler [Page 6]
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