From api.bing.com
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The UFC currently uses five weight classes:
In addition, there are four other weight classes specified in the Unified Rules which the UFC does not currently utilize: Flyweight (under 125 lb, 57 kg), Bantamweight (126 to 135 lb, 61 kg), Featherweight (136 to 145 lb, 66 kg), and Super Heavyweight ( above 265 lb, 120 kg). The Flyweight, Bantamweight, and Featherweight classes are used in another promotion owned by Zuffa, LLC, World Extreme Cagefighting.