show route

A very helpful command that is good to know

$ sudo route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.6.0.129      0.0.0.0         UG    0      0        0 eth0
10.6.0.128      0.0.0.0         255.255.255.224 U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
-n option means that you want numerical IP addresses displayed, instead of the corresponding host names.

$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         10.6.0.129      0.0.0.0         UG        0 0          0 eth0
10.6.0.128      0.0.0.0         255.255.255.224 U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
192.168.122.0   0.0.0.0         255.255.255.0   U         0 0          0 virbr0
-r option specifies that you want the routing table
-n option is similar to that of the route command

$ ip route list
default via 10.6.0.129 dev eth0
10.6.0.128/27 dev eth0  proto kernel  scope link  src 10.6.0.136
169.254.0.0/16 dev eth0  scope link  metric 1000
192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1