HOSTS(SFF)                                 UNIX System V



     Name
          hosts - list of hosts on network


     Description
          The file /etc/hosts is  a  list  of  hosts  that  share  the
          network,  including  the  local  host.  It is referred to by
          programs that need to translate between host names and DARPA
          Internet  addresses  when  the name server is not being used
          [See named(ADMN).] Each line in the file describes a  single
          host  on  the network and consists of three fields separated
          by any number of blanks or tabs:

               address name aliases ...

          where

               address       is the DARPA  Internet  address.   Unless
                             another  type  of  address is required by
                             some host on the network, address  should
                             be  a  Class  A  address, which takes the
                             form net.node, where net is  the  network
                             number  from  /etc/networks (see networks
                             (4)), that must between 0  and  127;  and
                             node  is a value which must be unique for
                             each host and be between 0 and 16777215.

               name          is the official name of the host.  If the
                             host  is  a computer system running UNIX,
                             it must claim this host name by executing
                             hostname(TC)   when  it  is  initializing
                             itself.

               aliases...    is a list  of  alternate  names  for  the
                             host.   Aliases  can  be  used in network
                             commands in place of the official name.

          It is suggested that you specify the hostname and  the  node
          name  [see  hostname(TC)  and  uname(C)]  as aliases for one
          another for each machine listed in the /etc/hosts file.

          The  routines  which  search  this  file   ignore   comments
          (portions of lines beginning with #) and blank lines.

          An internet address can actually take one of four forms:

               A         A is a simple 32-bit integer.

               A.B       A is  an  eight-bit  quantity  occupying  the
                         high-order  byte  and  B is a 24-bit quantity
                         occupying the remaining bytes.  This form  is
                         suitable  for  a  Class A address of the form
                         net.node.

               A.B.C     A is  an  eight-bit  quantity  occupying  the
                         high-order  byte;  B is an eight-bit quantity
                         occupying the next byte; and C  is  a  16-bit
                         quantity occupying the remaining bytes.  This
                         form is suitable for a Class B address of the
                         form 128.net.node.

               A.B.C.D   The four parts each  occupy  a  byte  in  the
                         address.


     Example
     #    Engineering network

     192.35.53.1     laizy.Lachman.COM laizy
     192.35.53.2     laidback.Lachman.COM laidback
     192.35.53.85    laiter.Lachman.COM laiter# Sun-3/50 [stevea]


     Files
          /etc/hosts


     See Also
          hostname(TC), uname(C), networks(SFF), inet(ADMP).


     (printed 8/17/89)                                  HOSTS(SFF)