C172 ENTERED NY ADIZ WITHOUT AUTHORIZATION.

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AT APPROX XA:00 LOCAL TIME; I DEPARTED MY HOME BASE CT (BDR) FOR A SHORT LOCAL WBOUND FLT AT APPROX 1300 FT. FLEW DIRECT TO NORWALK/DARIEN CT AREA AND AFTER A FEW MINS RETURNED TO BDR. UPON TURNING LEFT BASE FOR RWY 29 TWR ASKED FOR FULL CALL SIGN. AFTER EXITING THE ACTIVE; CONTACTED GND FOR TAXI INSTRUCTIONS AND WAS ASKED BY GND TO COPY A TELEPHONE NUMBER FOR N90 TRACON; CTLR SAID IT HAD TO DO WITH A VIOLATION. IMMEDIATELY AFTER SHUTDOWN; I CALLED N90 TRACON ON MY CELL PHONE. THE PERSON ANSWERING AT TRACON SAID THAT I HAD PENETRATED THE OUTER EDGE OF THE NEWLY EXTENDED CTLED AIRSPACE AROUND NYC. ALTHOUGH I HAD FAMILIARIZED MYSELF WITH THE ADIZ NOTAM PRIOR TO THE FLT; THE LIMITS OF THE ADIZ WERE UNCLR. I HAD ERRONEOUSLY BELIEVED THAT MY NAVIGATION EQUIP WOULD REVEAL ITS BOUNDARIES. AFTER A SHORT DISCUSSION; THE PERSON SAID THAT HE WOULD NOT ISSUE A VIOLATION THIS TIME; BUT MY ACFT REGISTRATION NUMBER IS NOW ON FILE WITH N90 TRACON AND IF THIS WERE TO HAPPEN AGAIN; IT 'WOULD BE OUT OF HIS HANDS AND A VIOLATION WOULD BE ISSUED.'