DoD Internet host table specification (RFC0952)
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2001-Jul-12
Internet Society Requests For Comment (RFCs)
K. Harrenstien: AUTHOR [+3]
AbstractThe DoD Host Table is utilized by the DoD Hostname Server maintained by the DDN Network Information Center (NIC) on behalf of the Defense Communications Agency (DCA) [See RFC-953].
Network Working Group K. Harrenstien (SRI) Request for Comments: 952 M. Stahl (SRI)
E. Feinler (SRI) Obsoletes: RFC 810, 608 October 1985
DOD INTERNET HOST TABLE SPECIFICATION
STATUS OF THIS MEMO
This RFC is the official specification of the format of the Internet Host Table. This edition of the specification includes minor revisions to RFC-810 which brings it up to date. Distribution of this memo is unlimited.
The DoD Host Table is utilized by the DoD Hostname Server maintained by the DDN Network Information Center (NIC) on behalf of the Defense Communications Agency (DCA) [See RFC-953].
LOCATION OF THE STANDARD DOD ONLINE HOST TABLE
A machine-translatable ASCII text version of the DoD Host Table is online in the file NETINFO:HOSTS.TXT on the SRI-NIC host. It can be obtained via FTP from your local host by connecting to host SRI-NIC.ARPA (126.96.36.199 or 10.0.0.51), logging in as user ANONYMOUS, password GUEST, and retrieving the file "NETINFO:HOSTS.TXT". The same table may also be obtained via the NIC Hostname Server, as described in RFC-953. The latter method is faster and easier, but requires a user program to make the necessary connection to the Name Server.
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), minus sign (-), and period (.). Note that periods are only allowed when they serve to delimit components of "domain style names". (See RFC-921, "Domain Name System Implementation Schedule", for background). 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 an alpha character. 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. Hosts which do not serve as Internet gateways should not use "-GATEWAY" and "-GW" as part of their names. A host which is a TAC should have "-TAC" as the last part of its host name, if it is a DoD host. Single character names or nicknames are not allowed.
2. Internet Addresses are 32-bit addresses [See RFC-796]. In the
Harrenstien Stahl Feinler [Page 1]
RFC 952 October 1985 DOD INTERNET HOST TABLE SPECIFICATION
host table described herein each address is represented by four decimal numbers separated by a period. Each decimal number represents 1 octet.
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) [See RFC-943].
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 ne...