R: RIP (Routing Information Protocol) assigned route.
I: ICMP (Internet Control Message Protocol) Redirect route.
Network Address: Destination IP address.
Netmask: The Sub Network Mask associated with the destination. This is a template that identifies the address bits in the destination address used for routing to specific subnets. Each bit that corresponds to a "1" is part of the subnet mask number; each bit that corresponds to "0" is part of the host number.
Gateway: The IP address of the router at the next hop to which frames are forwarded.
Interface: The local interface through which the next hop of this route is reached.
Metric: When a router receives a routing update that contains a new or changed destination network entry, the router adds 1 to the metric value indicated in the update and enters the network in the routing table.