CORP ACFT FINDS DEST ARPT CLOSED; FLIES TO ALTERNATE AND LANDS. AFTER THE FACT; DETERMINES SECOND ARPT CLOSED. NO MARKINGS.

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WE WERE OPERATING IN VFR CONDITIONS AND WERE UNABLE TO LAND AT OUR INTENDED DEST (IRK) DUE TO RWY CLOSED. WE DECIDED TO DIVERT TO A NEARBY ARPT (K89) AND HAVE OUR PAX DRIVE THERE TO MEET US. WE MADE A NORMAL LNDG AT K89; ANNOUNCING OUR POS AND INTENTIONS ON UNICOM 122.8. AFTER LNDG WE CONTACTED OUR PAX AT IRK AND DISCOVERED THE RWY AT IRK HAD BEEN OPENED. WE DEPARTED K89 AND WENT TO IRK TO PICK UP OUR PAX. ALTHOUGH NO ONE HAD SAID ANYTHING TO US ON THE UNICOM; A LCL PLT AT IRK SAID HE HAD HEARD US ANNOUNCE OUR INTENTIONS TO LAND AT K89. HE INFORMED US THAT THE K89 ARPT WAS CLOSED. WE LATER CHKED NOTAMS FOR K89 AND THE ARPT WAS INDEED NOTAMED CLOSED. AT NO TIME DURING OUR ARR OR DEP AT K89 DID I OBSERVE AN X ON ANY PART OF THE RWY. I BELIEVE THIS INCIDENT WOULD NOT HAVE OCCURRED IF THERE HAD BEEN AN X ON EACH END OF THE RWY AT K89. I GUESS THIS GOES TO SHOW THAT YOU CAN NEVER HAVE TOO MUCH INFO CONCERNING A PARTICULAR FLT. ALTHOUGH WE DID NOT INTEND TO USE THE K89 ARPT WHEN WE DEPARTED FOR IRK; IF WE HAD CHKED NOTAMS FOR ARPTS IN THE VICINITY OF IRK; WE WOULD HAVE KNOWN THAT K89 WAS CLOSED. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: RPTR STATES THE ARPT AT ORIGINAL DEST DID HAVE X'S ON THE RWY; SO THEY KNEW NOT TO LAND THERE. SECOND ARPT HAD NO MARKINGS. CAPT OF THIS FLT RECEIVED THE BRIEFING AND WAS NOT GIVEN ANY NOTAM REF CLOSED RWY. FLC DID NOT INQUIRE ABOUT THEIR ALTERNATE ARPT BUT ALSO DID NOT SEE ANY MARKINGS.