Here's the current status of Region 10 never used callsigns:
1. Group A 1x2 and 2x1: None available.
2. Group A 2x2: Open past AD0WS.
3. Group B 2x2 K prefix: Open past KI0TK.
4. Group B 2x2 W prefix: Wide open, very few vanities.
5. Group B 2x2 N prefix: Wide open, very few vanities.
6. Group C (1x3): You’ll need to search.
7. Group D (2x3): Open past KE0LQV.
KA0AA to KI0TI generally open, search first.