+Nodes are colored according to their reachability:
+red nodes are unreachable, orange nodes are indirectly reachable, green nodes are directly reachable.
+Black nodes are either directly or indirectly reachable, but direct reachability has not been tried yet.
+.It info Ar node | subnet | address
+Show information about a particular node, subnet or address.
+If an address is given, any matching subnet will be shown.