DoD Internet host table specification
RFC 810
Document | Type |
RFC - Unknown
(March 1982; No errata)
Obsoleted by RFC 952
Obsoletes RFC 608
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Authors | |||
Last updated | 2013-03-02 | ||
Stream | Legacy | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | Legacy state | (None) | |
Consensus Boilerplate | Unknown | ||
RFC Editor Note | (None) | ||
IESG | IESG state | RFC 810 (Unknown) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Elizabeth Feinler RFC 810 Ken Harrenstien 1 March 1982 Zaw-Sing Su References: RFC 811, 796 Vic White Obsoletes: RFC 608 Network Information Center SRI International DoD INTERNET HOST TABLE SPECIFICATION INTRODUCTION The ARPANET Official Network Host Table, as outlined in RFC 608, no longer suits the needs of the DoD community, nor does it follow a format suitable for internetting. This paper specifies a new host table format applicable to both ARPANET and Internet needs. In addition to host name to host address translation and selected protocol information, we have also included network and gateway name to address correspondence, and host operating system information. This Host Table is utilized by the DoD Host Name Server maintained by the ARPANET Network Information Center (NIC) on behalf of the Defense Communications Agency (DCA) (RFC 811). It obsoletes the host table described in RFC 608. LOCATION OF THE STANDARD DoD ONLINE HOST TABLE A machine-translatable ASCII text version of the new DoD Host Table is online in the file <NETINFO>HOSTS.TXT on the SRI-NIC host. It can be obtained by connecting to host SRI-NIC (10.0.0.73) from your local FTP server, logging in as user=ANONYMOUS, password=GUEST, and doing a 'get' on <NETINFO>HOSTS.TXT. The same table may also be obtained via the NIC Host Name Server. NOTE: See Appendix A. for timeframe for cutover. ASSUMPTIONS 1. A "name" (Net, Host, Gateway, or Domain name) is a text string up to 24 characters drawn from the alphabet (A-Z), digits (0-9), and the minus sign (-) and period (.). No blank or space characters are permitted as part of a name. No distinction is made between upper and lower case. The first character must be a letter. The last character must not be a minus sign or period. A host which serves as a GATEWAY should have "-GATEWAY" or "-GW" as part of its name. A host which is a TIP or a TAC should have "-TIP" or "-TAC" as part of its host name, if it is an ARPANET or DoD host. 2. Internet Addresses are 32-bit addresses (RFC 796). In the host table described herein each address is represented by four decimal numbers separated by a period. Each decimal number represents 1 octet. [Page 1] RFC 810 1 March 1982 Host Table Specification 3. If the first bit of the first octet of the address is 0 (zero), then the next 7 bits of the first octet indicate the network number (Class A Address). If the first two bits are 1,0 (one,zero), then the next 14 bits define the net number (Class B Address). If the first 3 bits are 1,1,0 (one,one,zero), then the next 21 bits define the net number (Class C Address) (RFC 796). This is depicted in the following diagram: +--------------+-----------------------------------------------+ |0| NET <-7-> | LOCAL ADDRESS <-24-> | +--------------+-----------------------------------------------+ +---+--------------------------+-------------------------------+ |1 0| NET <-14-> | LOCAL ADDRESS <-16-> | +---+--------------------------+-------------------------------+ +-----+----------------------------------------+---------------+ |1 1 0| NET <-21-> | LOCAL ADDRESS | +-----+----------------------------------------+---------------+ 4. The LOCAL ADDRESS portion of the internet address identifies a host within the network specified by the NET portion of the address. 5. For the ARPANET (a Class A network), the NET address is 10 (decimal) and the LOCAL ADDRESS maps as follows: the second octet defines the physical host, the third octet defines the logical host, and the fourth defines the IMP. +-+-------------+---------------+--------------+---------------+ |0| 10 | HOST | LOGICAL HOST | IMP | +-+-------------+---------------+--------------+---------------+ (NOTE: RFC 796 describes the local address mappings for several other networks.) 6. It is the responsibility of the user using this host table to translate it into whatever format is needed for his or her purposes. 7. Names and Addresses for DoD networks, gateways, and hosts will be negotiated and registered with the Network Information Center (NIC@SRI-NIC or (415) 859-4775) before being used and before traffic is passed by a DoD host. For an interim period the NIC will attempt to keep similar information for non-DoD networks and hosts if thisShow full document text