ALTDEV ALT EXCURSION -- THIS ACR CREW FORGOT TO GET THEIR IFR CLRNC AND WHILE ATTEMPTING TO DO SO ENRTE; THEY CLBED A BIT HIGHER THAN CLRED.

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FO FAILED TO PICK UP COPY OF ATC CLRNC FROM PRINTER. WE DID NOT HAVE ONBOARD PRINTER FOR PDC'S. I ASSUMED FO HAD PICKED UP CLRNC AS WE BRIEFED THE DEP AND I ASSUMED FO WAS BRIEFING FROM CLRNC. WE TOOK OFF AND DURING CLB DEN DEP NOTED THAT THEY WERE SHOWING A CODE OF '0000.' I SAID STAND-BY AND THOUGHT FO HAD FORGOTTEN TO PUT CODE IN XPONDER. AT THIS POINT IT BECAME CLR THAT FO DID NOT HAVE CLRNC IN COCKPIT. I ASKED DEP WHAT CODE THEY SHOWED AND THEY REPLIED WITH THE NUMBER AND A HDOF TO CTR. I SWITCHED TO CTR; CHKED IN AND REQUESTED CONFIRMATION THAT THEY HAD OUR CLRNC AND READ THEM THE ROUTING WE HAD FILED; ETC. THEY RESPONDED THAT THEIRS WAS THE SAME. WE HAD BEEN FLYING OUT OF NEW DEN TWICE A DAY FOR THE PAST WK AND WERE FAMILIAR WITH THE DEP. I HAD BRIEFED WHAT I THOUGHT WAS THE CLRNC AND THE FO WAS REALLY BRIEFING THE FILED ROUTING. I NOW ASK TO SEE THE CLRNC -- WRITTEN OR PRINTED BEFORE EVERY BRIEFING. MAJOR CONTRIBUTING FACTORS BOIL DOWN TO FATIGUE. THE PREVIOUS DAY WE FLEW 14 1/2 HRS OF DUTY TIME WITH WX FOLLOWED BY MINIMUM SLEEP (6 PLUS HRS) AND ANOTHER SCHEDULED 5 LEGS FOR 13 HRS AND 26 MINS PLUS CHK IN TIME FOR A DUTY DAY. DURING CLB DEN DEP INQUIRED ABOUT OUR XPONDER CODE JUST AS WE WERE TO LEVEL AT 10000 FT. MY FO HAD BEEN DISTRACTED AND BELIEVED WE WERE GOING TO 11000 FT. I IMMEDIATELY TOLD HER TO STOP AT 10000. BY THE TIME SHE HAD ARRESTED THE CLB AND STARTED BACK TO 10000 FT. WE HAD OVERSHOT BY ABOUT 500-600 FT ON THE ALTIMETER. PROCEDURAL AND WORKLOADS IN COCKPIT AT THAT MOMENT WERE A DISTR. ALSO A MAJOR CONTRIBUTOR WAS FATIGUE FROM A 14 1/2 HR DAY (5 LEGS) AND MINIMUM LAYOVER TIME FOLLOWED BY A SCHEDULED 13 1/2 HR (5 LEG) DAY.