The answer can be found on Technet
route
This diagnostic command manipulates network routing tables.
Syntax
route [-f] [command [destination] [MASK netmask] [gateway] [METRIC metric]]
Parameters
-f Clears the routing tables of all gateway entries. If this parameter is used in conjunction with one of the commands, the tables are cleared prior to running the command.
-p When used with the route add command, makes a route persistent across restarts of the computer. By default, routes are not preserved when the computer is restarted. When used with the route print command, displays the list of registered persistent routes. Ignored for all other commands.
command Specifies one of four commands.
Command Purpose
print Prints a route
add Adds a route
delete Deletes a route
change Modifies an existing route
destination Specifies the host to send command.
MASK Specifies, if present, that the next parameter be interpreted as the netmask parameter.
There's more ans you can find it at
http://www.microsoft.com/TechNet/winnt/reskit/sur_util.asp