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Old 11-01-2011
A subnet acts like a logical bus. As far as the machines are concerned, they're all hooked to one long wire which connects to every machine. No hosts are more or less direct than any other; handling the direction of traffic etc. becomes the switches' jobs. The switches handle this by comparing MAC addresses.

If you have advanced enough switches you may be able to pull the network organization from the switch itself, but unless it's an expensive switch that's unlikely.

If a big bus isn't the organization you want, you have to start using routers and break things into more subnets. (Router in the routing sense, not router in the linksys sense. You probably don't want NAT by the sounds of it.)
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LEARN ABOUT BSD

gettable

GETTABLE(8)						      System Manager's Manual						       GETTABLE(8)

NAME

       gettable - get NIC format host tables from a host

SYNOPSIS

       /usr/sbin/gettable [ -v ] host [ outfile ]

DESCRIPTION

       Gettable  is a simple program used to obtain the NIC standard host tables from a ``nicname'' server.  The indicated host is queried for the
       tables.	The tables, if retrieved, are placed in the file outfile or by default, hosts.txt.

       The -v option will get just the version number instead of the complete host table and put the output in the file  outfile  or  by  default,
       hosts.ver.

       Gettable  operates  by opening a TCP connection to the port indicated in the service specification for ``nicname''.  A request is then made
       for ``ALL'' names and the resultant information is placed in the output file.

       Gettable is best used in conjunction with the htable(8) program which converts the NIC standard file format to that  used  by  the  network
       library lookup routines.

SEE ALSO

       intro(3N), htable(8), named(8)

BUGS

       If the name-domain system provided network name mapping well as host name mapping, gettable would no longer be needed.

4.2 Berkeley Distribution					 November 17, 1996						       GETTABLE(8)