There are 24 Tirthankaras in each time cycle. In this cycle, the commonly accepted lineup (in order) is:

1) Rishabhanatha (Adinath) 2) Ajitnath 3) Sambhavanath 4) Abhinandanānath 5) Sumatinath 6) Padmaprabha 7) Suparshvanath 8) Chandraprabha 9) Pushpadanta (also called Suvidhinath) 10) Sheetalnath (Shitalnath) 11) Shreyansanath 12) Vasupujya 13) Vimalanath 14) Anantanath 15) Dharmanath 16) Shantinath 17) Kunthunath 18) Aranath 19) Mallinath 20) Munisuvratanath 21) Naminath 22) Neminath 23) Parshvanath 24) Mahavira (Vardhamana)

Note: spellings or epithets can vary slightly between Digambar and Śvetāmbara traditions, but the essential list and titular order are the same. You can read more about the 24 Tirthankaras on this Jain Knowledge page.