Apparatus

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sensors Mode-S transponder

A9C56A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N729EL · CESSNA 172 Skyhawk · operated by TECHBIT

Hex
A9C56A
Octal
52342552
Decimal
11,126,122
Country
US
Tail
N729EL
Type
C172
Broadcasting now · callsign N729EL · 4,175 ft
Flights observed
58
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Current position

A9C56A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9C56A 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
N729EL - 58 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-31 N729EL - May 31, 23:45 UTCMay 31, 23:50 UTC5m
2026-05-31 N729EL - May 31, 22:40 UTCMay 31, 23:40 UTC1h 0m
2026-05-31 N729EL - May 31, 21:55 UTCMay 31, 22:30 UTC35m
2026-05-30 N729EL PAO → PAO May 30, 00:30 UTCMay 30, 02:00 UTC1h 30m
2026-05-29 N729EL PAO → PAO May 29, 01:15 UTCMay 29, 01:35 UTC20m
2026-05-28 N729EL PAO → PAO May 28, 18:40 UTCMay 28, 20:10 UTC1h 30m
2026-05-28 N729EL PAO → PAO May 28, 01:30 UTCMay 28, 01:40 UTC10m
2026-05-28 N729EL PAO → PAO May 28, 01:15 UTCMay 28, 01:20 UTC5m
2026-05-28 N729EL PAO → PAO May 28, 01:00 UTCMay 28, 01:10 UTC10m
2026-05-28 N729EL PAO → PAO May 28, 00:35 UTCMay 28, 00:45 UTC10m
2026-05-28 N729EL PAO → PAO May 28, 00:25 UTCMay 28, 00:30 UTC5m
2026-05-25 N729EL - May 25, 21:19 UTCMay 25, 22:55 UTC1h 35m
2026-05-25 N729EL - May 25, 19:54 UTCMay 25, 20:19 UTC25m
2026-05-25 N729EL - May 25, 17:35 UTCMay 25, 18:10 UTC35m
2026-05-23 N729EL - May 23, 17:15 UTCMay 23, 17:45 UTC30m
2026-05-23 N729EL - May 23, 17:00 UTCMay 23, 17:10 UTC10m
2026-05-23 N729EL - May 23, 01:45 UTCMay 23, 03:40 UTC1h 55m
2026-05-21 N729EL PAO → PAO May 21, 02:00 UTCMay 21, 03:00 UTC1h 0m
2026-05-20 N729EL PAO → PAO May 20, 00:05 UTCMay 20, 02:05 UTC2h 0m
2026-05-19 N729EL - May 19, 00:35 UTCMay 19, 00:40 UTC5m
2026-05-18 N729EL - May 18, 23:45 UTCMay 19, 00:15 UTC30m
2026-05-18 N729EL PAO → SQL May 18, 23:00 UTCMay 18, 23:05 UTC5m
2026-05-17 N729EL PAO → PAO May 17, 22:01 UTCMay 17, 23:25 UTC1h 25m
2026-05-17 N729EL PAO → PAO May 17, 19:20 UTCMay 17, 20:20 UTC1h 0m
2026-05-16 N729EL PAO → PAO May 16, 19:20 UTCMay 16, 21:05 UTC1h 45m
2026-05-16 N729EL PAO → PAO May 16, 01:25 UTCMay 16, 02:10 UTC45m
2026-05-15 N729EL PAO → PAO May 15, 20:55 UTCMay 15, 22:00 UTC1h 5m
2026-05-15 N729EL - May 15, 00:40 UTCMay 15, 01:20 UTC40m
2026-05-14 N729EL HWD → MHR May 14, 23:30 UTCMay 15, 00:15 UTC45m
2026-05-14 N729EL PAO → HWD May 14, 22:25 UTCMay 14, 22:35 UTC10m
2026-05-13 N729EL PAO → PAO May 13, 19:50 UTCMay 13, 21:10 UTC1h 20m
2026-05-11 N729EL PAO → PAO May 11, 18:30 UTCMay 11, 19:50 UTC1h 20m
2026-05-10 N729EL PAO → PAO May 10, 23:44 UTCMay 11, 01:00 UTC1h 15m
2026-05-10 N729EL SBA → PAO May 10, 20:30 UTCMay 10, 22:15 UTC1h 45m
2026-05-09 N729EL PAO → SBA May 9, 18:50 UTCMay 9, 20:44 UTC1h 55m
2026-05-07 N729EL PAO → PAO May 7, 13:10 UTCMay 7, 15:20 UTC2h 10m
2026-05-07 N729EL PAO → PAO May 7, 00:55 UTCMay 7, 01:45 UTC50m
2026-05-06 N729EL - May 6, 19:00 UTCMay 6, 19:50 UTC50m
2026-05-06 N729EL - May 6, 16:55 UTCMay 6, 18:25 UTC1h 29m
2026-05-03 N729EL PAO → PAO May 3, 21:14 UTCMay 3, 22:15 UTC1h 0m
2026-04-28 N729EL - Apr 28, 20:55 UTCApr 28, 23:45 UTC2h 50m
2026-04-24 N729EL - Apr 24, 21:45 UTCApr 24, 23:35 UTC1h 50m
2026-04-24 N729EL - Apr 24, 18:45 UTCApr 24, 20:05 UTC1h 20m
2026-04-24 N729EL PAO → PAO Apr 24, 00:45 UTCApr 24, 01:15 UTC30m
2026-04-23 N729EL PAO → PAO Apr 23, 18:45 UTCApr 23, 19:15 UTC30m
2026-04-20 N729EL PAO → PAO Apr 20, 00:10 UTCApr 20, 00:20 UTC10m
2026-04-19 N729EL PAO → PAO Apr 19, 22:40 UTCApr 20, 00:05 UTC1h 25m
2026-04-18 N729EL PAO → PAO Apr 18, 18:00 UTCApr 18, 19:20 UTC1h 20m
2026-04-17 N729EL - Apr 17, 22:35 UTCApr 17, 22:55 UTC20m
2026-04-17 N729EL - Apr 17, 21:35 UTCApr 17, 21:45 UTC10m

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 N729EL page for operator, model, and routing details .

Mode-S A9C56A frequently asked

What is Mode-S code A9C56A?
A9C56A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N729EL.
Where is Mode-S A9C56A registered?
Mode-S code A9C56A 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 A9C56A broadcasting right now?
Yes. Mode-S A9C56A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9C56A, octal 52342552, decimal 11,126,122.
What flights does A9C56A operate?
Mode-S A9C56A has broadcast 1 distinct callsign, including N729EL.