What is the nest hop used to send traffic to reach 192.168.1.50?

172.17.12.51 does not match a gateway associated with the route to 192.168.1.50 in the routing table shown; it is likely another host address on the local segment.

192.168.1.50 is the destination host address, not the next-hop gateway - a router never lists the destination itself as the next hop unless the host is directly connected.

172.17.12.254 is the configured gateway (next hop) in the routing entry that covers the 192.168.1.0/24 or the relevant destination network, meaning the router will forward packets toward that gateway to reach 192.168.1.50. The next hop is the adjacent router interface through which the packet must travel, not the final destination address.

172.17.12.255 is the broadcast address of the 172.17.12.0 subnet and is never a valid unicast next-hop gateway for routing.