Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A9DA49

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N734DY · CESSNA 172 Skyhawk · operated by FOUR DELTA YANKEE INC

Hex
A9DA49
Octal
52355111
Decimal
11,131,465
Country
US
Tail
N734DY
Type
C172
No current signal · last broadcast Jul 25, 16:30 UTC
Flights observed
36
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 16:30 UTC

Last known position

Most recent position reported by Mode-S A9DA49.

Country allocation

The ICAO 24-bit address A9DA49 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N734DY - 36 2026-07-25

Recent flights last 36

DateFlightRouteTakeoffLandingDuration
2026-07-25 N734DY - Jul 25, 13:50 UTCJul 25, 16:30 UTC2h 40m
2026-07-24 N734DY - Jul 24, 15:35 UTCJul 24, 16:45 UTC1h 10m
2026-07-23 N734DY - Jul 23, 17:25 UTCJul 23, 17:55 UTC30m
2026-07-23 N734DY - Jul 23, 15:30 UTCJul 23, 16:40 UTC1h 10m
2026-07-23 N734DY - Jul 23, 12:15 UTCJul 23, 12:55 UTC40m
2026-07-20 N734DY - Jul 20, 20:30 UTCJul 20, 20:55 UTC25m
2026-07-17 N734DY - Jul 17, 14:15 UTCJul 17, 15:05 UTC50m
2026-07-12 N734DY - Jul 12, 16:20 UTCJul 12, 16:40 UTC20m
2026-07-12 N734DY - Jul 12, 14:45 UTCJul 12, 15:45 UTC1h 0m
2026-07-12 N734DY - Jul 12, 13:50 UTCJul 12, 14:05 UTC15m
2026-07-08 N734DY - Jul 8, 14:35 UTCJul 8, 15:35 UTC1h 0m
2026-07-03 N734DY - Jul 3, 15:35 UTCJul 3, 16:10 UTC35m
2026-06-30 N734DY - Jun 30, 20:35 UTCJun 30, 21:25 UTC50m
2026-06-30 N734DY - Jun 30, 10:35 UTCJun 30, 11:35 UTC1h 0m
2026-06-25 N734DY - Jun 25, 17:54 UTCJun 25, 18:34 UTC40m
2026-06-25 N734DY - Jun 25, 15:04 UTCJun 25, 15:34 UTC30m
2026-06-21 N734DY - Jun 21, 13:54 UTCJun 21, 16:04 UTC2h 10m
2026-06-16 N734DY - Jun 16, 18:55 UTCJun 16, 19:45 UTC50m
2026-06-16 N734DY - Jun 16, 14:25 UTCJun 16, 14:55 UTC30m
2026-06-16 N734DY - Jun 16, 09:55 UTCJun 16, 10:45 UTC50m
2026-06-12 N734DY - Jun 12, 12:10 UTCJun 12, 13:05 UTC55m
2026-06-09 N734DY - Jun 9, 19:20 UTCJun 9, 20:10 UTC50m
2026-06-06 N734DY - Jun 6, 15:39 UTCJun 6, 18:00 UTC2h 20m
2026-06-05 N734DY - Jun 5, 13:55 UTCJun 5, 15:40 UTC1h 45m
2026-06-04 N734DY - Jun 4, 14:25 UTCJun 4, 16:00 UTC1h 35m
2026-05-31 N734DY - May 31, 16:15 UTCMay 31, 16:35 UTC20m
2026-05-31 N734DY - May 31, 13:40 UTCMay 31, 15:45 UTC2h 5m
2026-05-25 N734DY - May 25, 21:54 UTCMay 25, 22:40 UTC45m
2026-05-18 N734DY - May 18, 22:45 UTCMay 18, 23:35 UTC50m
2026-05-17 N734DY - May 17, 19:15 UTCMay 17, 20:01 UTC45m
2026-05-17 N734DY - May 17, 13:45 UTCMay 17, 16:45 UTC3h 0m
2026-05-14 N734DY - May 14, 15:05 UTCMay 14, 15:55 UTC50m
2026-05-12 N734DY - May 12, 20:40 UTCMay 12, 21:10 UTC30m
2026-05-01 N734DY - May 1, 12:30 UTCMay 1, 13:00 UTC30m
2026-04-28 N734DY - Apr 28, 12:15 UTCApr 28, 13:05 UTC50m
2026-04-21 N734DY - Apr 21, 12:15 UTCApr 21, 13:05 UTC50m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N734DY page for operator, model, and routing details .

Mode-S A9DA49 frequently asked

What is Mode-S code A9DA49?
A9DA49 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N734DY.
Where is Mode-S A9DA49 registered?
Mode-S code A9DA49 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A9DA49 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 16:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9DA49, octal 52355111, decimal 11,131,465.
What flights does A9DA49 operate?
Mode-S A9DA49 has broadcast 1 distinct callsign, including N734DY.