Apparatus

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sensors Mode-S transponder

AB3C4B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N823D · CESSNA 172 Skyhawk · operated by ALF IX LLC

Hex
AB3C4B
Octal
52636113
Decimal
11,222,091
Country
US
Tail
N823D
Type
C172
No current signal · last broadcast 3d ago
Flights observed
74
Distinct callsigns
1
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S AB3C4B.

Country allocation

The ICAO 24-bit address AB3C4B 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
N823D - 74 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N823D DBQ → DBQ Jul 15, 15:45 UTCJul 15, 18:05 UTC2h 20m
2026-07-14 N823D DBQ → DBQ Jul 14, 16:20 UTCJul 14, 18:35 UTC2h 15m
2026-07-13 N823D DBQ → DBQ Jul 13, 16:05 UTCJul 13, 17:00 UTC55m
2026-07-07 N823D DBQ → DBQ Jul 7, 19:05 UTCJul 7, 19:50 UTC45m
2026-06-26 N823D DBQ → DBQ Jun 26, 16:14 UTCJun 26, 17:00 UTC45m
2026-06-25 N823D DBQ → DBQ Jun 25, 20:09 UTCJun 25, 21:05 UTC55m
2026-06-25 N823D DBQ → DBQ Jun 25, 18:19 UTCJun 25, 18:55 UTC35m
2026-06-25 N823D DBQ → DBQ Jun 25, 15:54 UTCJun 25, 16:39 UTC45m
2026-06-22 N823D DBQ → DBQ Jun 22, 19:09 UTCJun 22, 19:14 UTC5m
2026-06-18 N823D DBQ → DBQ Jun 18, 13:00 UTCJun 18, 14:20 UTC1h 20m
2026-06-03 N823D DBQ → DBQ Jun 3, 12:40 UTCJun 3, 13:35 UTC55m
2026-06-02 N823D DBQ → DBQ Jun 2, 22:10 UTCJun 3, 01:10 UTC3h 0m
2026-06-02 N823D DBQ → DBQ Jun 2, 18:30 UTCJun 2, 19:30 UTC1h 0m
2026-06-02 N823D DBQ → DBQ Jun 2, 16:35 UTCJun 2, 17:30 UTC55m
2026-06-02 N823D DBQ → DBQ Jun 2, 14:30 UTCJun 2, 15:35 UTC1h 5m
2026-06-02 N823D DBQ → DBQ Jun 2, 12:35 UTCJun 2, 13:35 UTC1h 0m
2026-06-02 N823D DBQ → DBQ Jun 2, 02:55 UTCJun 2, 04:50 UTC1h 55m
2026-06-02 N823D - Jun 2, 01:25 UTCJun 2, 01:35 UTC10m
2026-06-02 N823D - Jun 2, 00:15 UTCJun 2, 00:30 UTC15m
2026-06-01 N823D DBQ → DBQ Jun 1, 20:20 UTCJun 1, 21:25 UTC1h 5m
2026-06-01 N823D DBQ → DBQ Jun 1, 17:50 UTCJun 1, 18:45 UTC55m
2026-06-01 N823D DBQ → DBQ Jun 1, 15:30 UTCJun 1, 16:45 UTC1h 15m
2026-06-01 N823D - Jun 1, 12:40 UTCJun 1, 13:00 UTC20m
2026-05-30 N823D - May 30, 22:05 UTCMay 31, 00:05 UTC2h 0m
2026-05-30 N823D - May 30, 17:25 UTCMay 30, 18:55 UTC1h 30m
2026-05-29 N823D - May 29, 22:20 UTCMay 29, 22:50 UTC30m
2026-05-22 N823D - May 22, 19:15 UTCMay 22, 19:40 UTC25m
2026-05-19 N823D DBQ → DBQ May 19, 22:05 UTCMay 19, 22:55 UTC50m
2026-05-19 N823D DBQ → DBQ May 19, 16:55 UTCMay 19, 18:40 UTC1h 45m
2026-05-19 N823D DBQ → DBQ May 19, 13:35 UTCMay 19, 15:15 UTC1h 40m
2026-05-19 N823D DBQ → DBQ May 19, 01:55 UTCMay 19, 04:10 UTC2h 15m
2026-05-18 N823D DBQ → DBQ May 18, 21:30 UTCMay 19, 00:25 UTC2h 55m
2026-05-18 N823D DBQ → DBQ May 18, 19:00 UTCMay 18, 20:10 UTC1h 10m
2026-05-14 N823D DBQ → DBQ May 14, 16:35 UTCMay 14, 19:05 UTC2h 30m
2026-05-11 N823D DBQ → MXO May 11, 21:45 UTCMay 11, 22:35 UTC49m
2026-05-11 N823D DBQ → DBQ May 11, 19:00 UTCMay 11, 19:40 UTC40m
2026-05-08 N823D DBQ → DBQ May 8, 16:45 UTCMay 8, 17:45 UTC1h 0m
2026-05-08 N823D DBQ → DBQ May 8, 14:05 UTCMay 8, 15:30 UTC1h 25m
2026-05-07 N823D DBQ → DBQ May 7, 16:10 UTCMay 7, 17:20 UTC1h 10m
2026-05-05 N823D DBQ → DBQ May 5, 16:25 UTCMay 5, 17:15 UTC50m
2026-04-30 N823D DBQ → DBQ Apr 30, 15:45 UTCApr 30, 16:40 UTC55m
2026-04-24 N823D DBQ → DBQ Apr 24, 19:50 UTCApr 24, 20:35 UTC45m
2026-04-23 N823D DBQ → DBQ Apr 23, 14:20 UTCApr 23, 15:25 UTC1h 5m
2026-04-23 N823D DBQ → DBQ Apr 23, 12:01 UTCApr 23, 12:55 UTC55m
2026-04-23 N823D - Apr 23, 03:15 UTCApr 23, 04:35 UTC1h 20m
2026-04-22 N823D - Apr 22, 23:15 UTCApr 22, 23:40 UTC25m
2026-04-22 N823D - Apr 22, 22:25 UTCApr 22, 22:45 UTC20m
2026-04-22 N823D - Apr 22, 21:10 UTCApr 22, 21:25 UTC15m
2026-04-22 N823D - Apr 22, 20:25 UTCApr 22, 20:40 UTC15m
2026-04-22 N823D DBQ → DBQ Apr 22, 18:35 UTCApr 22, 19:15 UTC40m

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 N823D page for operator, model, and routing details .

Mode-S AB3C4B frequently asked

What is Mode-S code AB3C4B?
AB3C4B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N823D.
Where is Mode-S AB3C4B registered?
Mode-S code AB3C4B 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 AB3C4B broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3C4B, octal 52636113, decimal 11,222,091.
What flights does AB3C4B operate?
Mode-S AB3C4B has broadcast 1 distinct callsign, including N823D.