In this case, all but one entry is for a subnet. The gateway column has 0.0.0.0, if the destination can be reached on the local network. If the route goes through a router or gateway to get to the listed destination, then there is an IP address in the gateway column. Every subnet must have the same netmask for each interface entry on that subnet. Any one machine may have different netmask in its table, but all machines have the same mask for any given subnet.
All entries have the U, indicating Up and running.
There is no problem having more than one entry for an interface. IP 206.76.0.41 is the remote interface on the PPP connection. The daemon pppd will provide the IP for you. Here are the commands I used in rc.route to produce this table, not including pppd . Note there is not a default gateway, until after pppd is ran.