In this research, we present the analysis on Lightweight Block Cipher; KTANTAN. This block cipher consists of three algorithms with block sizes of 32/48/64-bit and utilizes an 80-bit key. NIST Statistical Test Suite is used to determine the randomness of output sequence produced by all algorithms. Nine data categories are applied to generate the output sequence. From our analysis, we found out that all three algorithms are not random based on the 1% significance level.