Yes, 192.0.0.0/24 is Special-Purpose Address Registry. These routes are called martian routes. Use > show route martians table inet.0 to view other martian routes.
If you can install 192.0.0.0/24 route in local routing table with knob ( not recommended ).
[ edit routing-options ]
user@host# set martians 192.0.0.0/24 orlonger allow
[ edit routing-options ]
user@host# run show route martians table inet.0
inet.0:
0.0.0.0/0 exact -- allowed
0.0.0.0/8 orlonger -- disallowed
127.0.0.0/8 orlonger -- disallowed
192.0.0.0/24 orlonger -- allowed
240.0.0.0/4 orlonger -- disallowed
224.0.0.0/4 exact -- disallowed
224.0.0.0/24 exact -- disallowed