In Jain cosmology, each half-cycle has 24 Tirthankars. The commonly remembered list of 24 names is the one for the present avasarpiṇī cycle:

1. Ṛṣabhanātha
2. Ajitanātha
3. Sambhavanātha
4. Abhinandananātha
5. Sumatinātha
6. Padmaprabhu
7. Supārśvanātha
8. Candraprabhu
9. Suvidhinātha (Puṣpadanta)
10. Śītalanātha
11. Śreyāṃsanātha
12. Vāsupūjya
13. Vimalanātha
14. Anantanātha
15. Dharmanātha
16. Śāntinātha
17. Kunthunātha
18. Arahanātha
19. Mallinātha
20. Munisuvrata
21. Naminātha
22. Neminātha
23. Pārśvanātha
24. Mahāvīra

If you mean the previous cycle’s 24 Tirthankars specifically, that list is not commonly preserved in the standard Jain tradition in the same way as the present-cycle list.