AN ACR CREW LANDS WITHOUT CLRNC AFTER NO HDOF OR FREQ CHANGE. TWR WAS NOT AWARE NO CLRNC WAS ISSUED WHEN INITIAL CALL WAS MADE AFTER LNDG.

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AFTER LNDG AND TURNING OFF RWY 18R IN CVG; THE FREQ I CALLED TWR ON TURNED OUT TO BE STILL APCH. THIS IS WHEN WE REALIZED WE HAD NEVER SWITCHED TO TWR. I DON'T THINK APCH EVER TOLD US TO SWITCH TO TWR AND I THOUGHT WE WERE CLRED TO LAND JUST BECAUSE OF HABIT. THE CAPT EVEN ASKED ON SHORT FINAL; ARE WE CLRED TO LAND AND I SAID YES. THE CAPTS ALWAYS RHETORICALLY ASK THAT QUESTION AND I SAID YES OUT OF HABIT. THERE IS ALWAYS SUCH A STREAM OF INFO WHEN THE CTLR CLRS YOU FOR YOUR FINAL TURN; PLUS A DSCNT; THEN TO MAINTAIN THAT ALT UNTIL ESTABLISHED; AND THEN CLRED FOR THE APCH AND; THEN LAST BUT NOT LEAST; CONTACT THE TWR ON 118.3. DURING THIS BUSY TIME IN AN APCH; IT IS OFTEN HARD TO HEAR AND REPEAT AND DO ALL THAT IS SAID. IN TODAY'S CROWDED SKIES; THE CTLRS OFTEN SPEAK AT LIGHT SPD. NONETHELESS; I SHOULD HAVE BEEN SURE WE WERE CLRED TO LAND. AFTER LNDG AND PARKING AT THE GATE; THE CAPT CALLED THE TWR AND THEY SAID IT WAS NO PROB BECAUSE THEY EVEN THOUGHT THEY HAD CLRED US TO LAND. THEY SAID WE TURNED OFF AT THE RIGHT PLACE AND IMMEDIATELY CALLED THEM SO NOT TO WORRY. IT WAS MY MISTAKE; BUT THE SYS LEADS US TO MAKE THE COM ERRORS BECAUSE OF THE TIME COMPRESSION OF THE CTLR'S XMISSIONS AND THE TIMING OF WHEN THEY OCCUR.