The route command is the interface used to access the Linux kernel’s routing tables. The route command operates in three modes: display, add, and delete. When used to add or delete routes from the routing table, its use is generally limited to adding and removing static route entries.
When route is used with no parameters, the route command prints the routing table to stdout:
[root@lefty /root]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface Lefty * 255.255.255.255 UH 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 127.0.0.0 * 255.0.0.0 U 0 0 0 lo default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
The Destination column when combined with the Genmask, which is ...