According to japanese wiki, inuyasha has 4 seasons without final season which has ep 168 to 193. including the final season, inuyasha has 5 seasons. I guess japan wiki's anime project has much more accurate info. the season 1 has ep 1 to 44 and named 出会い編, the season 2 has ep 45 to 87 and named 成長編, the season 3 has ep 88 to 126 and named 七人隊編, the season 4 has ep 127 to 167 and named 激闘編. https://ja.wikipedia.org/wiki/%E7%8A%AC%E5%A4%9C%E5%8F%89#%E3%82%A2%E3%83%8B%E3%83%A1