We search for direct CP violation in flavor specific B → Kπ decays by measuring the rate asymmetry between charge conjugate modes. The search is performed on a data sample of 11.1 × 106 BB events recorded on the Y(4S) resonance by the Belle experiment at KEKB. We measure 90% confidence intervals in the partial rate asymmetry ACP of -0.25<ACP(K∓π±)<0.37, -0.40<ACP(K∓π0)<0.36, and -0.53 <A CP (K0π∓)<0.82. By combining the K∓π± and K∓π0 final states, we conclude that -0.22 <ACP(K∓(π± + π0))<0.25 at the 90% confidence level.
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