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Connect your amplifier in unity gain feedback configuration ( negative feedback) and sweep the positive input from the negative supply rail to the positive supply rail. The range of voltages for which the output follows the input voltage i.e. the output voltage is equal to the input voltage is your ICMR.
dear assembly ,u r absolutely wrong .the technique u r telling me is for operational amplifier whose opern loop gain is quite high.but for singal stage amplifier whose open loop gain is low cannot be used as unity gain amplifier as it does not provide virtual ground on the input.