$ /sbin/route -n
Output:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
191.255.255.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 191.255.255.1 0.0.0.0 UG 0 0 0 eth0
Please note that a destination entry 0.0.0.0 (or default) is the default gateway.
In above example 191.255.255.1 is a default gateway.