RFC 811 (rfc811) - Page 2 of 4

Hostnames Server

                                                            1 March 1982
RFC 811                                                 Hostnames Server
                                                                        
                                                                        
      Response Keys:

         ERR     (entry not found, nature of error follows)
         NET     (entry found, rest of entry follows)
         GATEWAY (entry found, rest of entry follows)
         HOST    (entry found, rest of entry follows)
         BEGIN   (followed by multiple entries)
         END     (done with BEGIN block of entries)

   More keywords will be added as new needs are recognized.  A
   more detailed description of the allowed requests/responses
   will follow.

PROTOCOL

   To access this server from a program, connect to service host
   (SRI-NIC)

      TCP: port 101 decimal
      NCP: socket 101 decimal for ICP

   send the information query, and await the response.

   Note:  Care should be taken to interpret the nature of the
   reply (e.g, single record or multiple record), so that no
   confusion about the state of the reply results.  An "ALL"
   request will likely return several hundred or more records of
   all types (see RFC 810), whereas "HNAME" or "HADDR" will
   usually return one HOST record, or "BEGIN:", list of host
   records, "END:", if there is more than one match.

QUERY/RESPONSE EXAMPLES

   1. HNAME Query - Given a name, find the entry or entries that
   match
      the name.  For example:

         HNAME SRI-NIC    ;where  is a carriage
      return/
                                 linefeed, and 'SRI-NIC' is a
      host name

      The likely response is:

         HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :

      A response may stretch across more than one line.
      Continuation lines always begin with at least one space.
      For example:

      HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :