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sensors Mode-S transponder

A139D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1784Q · CESSNA 150 · operated by RED CARDINAL AVIATION LLC

Hex
A139D8
Octal
50234730
Decimal
10,566,104
Country
US
Tail
N1784Q
Type
C150
No current signal · last broadcast 12d ago
Flights observed
151
Distinct callsigns
1
Country
US
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S A139D8.

Country allocation

The ICAO 24-bit address A139D8 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
N1784Q - 151 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N1784Q - Jul 26, 20:55 UTCJul 26, 21:25 UTC30m
2026-07-25 N1784Q - Jul 25, 22:15 UTCJul 25, 22:45 UTC30m
2026-07-25 N1784Q - Jul 25, 20:20 UTCJul 25, 21:10 UTC50m
2026-07-24 N1784Q - Jul 24, 02:30 UTCJul 24, 03:15 UTC45m
2026-07-24 N1784Q - Jul 24, 00:15 UTCJul 24, 01:05 UTC50m
2026-07-20 N1784Q - Jul 20, 20:45 UTCJul 20, 21:35 UTC50m
2026-07-20 N1784Q - Jul 20, 19:05 UTCJul 20, 19:20 UTC15m
2026-07-19 N1784Q - Jul 19, 21:00 UTCJul 19, 21:10 UTC10m
2026-07-14 N1784Q - Jul 14, 23:55 UTCJul 15, 00:40 UTC45m
2026-07-14 N1784Q - Jul 14, 01:25 UTCJul 14, 03:05 UTC1h 40m
2026-07-13 N1784Q - Jul 13, 01:15 UTCJul 13, 03:15 UTC2h 0m
2026-07-11 N1784Q - Jul 11, 21:35 UTCJul 11, 22:01 UTC25m
2026-07-11 N1784Q - Jul 11, 17:50 UTCJul 11, 18:15 UTC25m
2026-07-06 N1784Q - Jul 6, 16:45 UTCJul 6, 17:20 UTC35m
2026-07-05 N1784Q - Jul 5, 13:55 UTCJul 5, 14:45 UTC50m
2026-07-04 N1784Q - Jul 4, 13:50 UTCJul 4, 14:20 UTC30m
2026-07-03 N1784Q - Jul 3, 15:20 UTCJul 3, 15:30 UTC10m
2026-07-03 N1784Q - Jul 3, 13:50 UTCJul 3, 14:50 UTC1h 0m
2026-07-03 N1784Q - Jul 3, 11:30 UTCJul 3, 11:40 UTC10m
2026-07-03 N1784Q - Jul 3, 01:30 UTCJul 3, 03:05 UTC1h 35m
2026-07-02 N1784Q - Jul 2, 11:45 UTCJul 2, 12:40 UTC55m
2026-07-02 N1784Q - Jul 2, 01:00 UTCJul 2, 01:40 UTC40m
2026-07-01 N1784Q - Jul 1, 23:50 UTCJul 2, 00:30 UTC40m
2026-07-01 N1784Q - Jul 1, 19:25 UTCJul 1, 19:45 UTC20m
2026-06-30 N1784Q - Jun 30, 16:00 UTCJun 30, 16:45 UTC45m
2026-06-30 N1784Q - Jun 30, 01:35 UTCJun 30, 02:10 UTC35m
2026-06-30 N1784Q - Jun 30, 00:30 UTCJun 30, 01:00 UTC30m
2026-06-25 N1784Q - Jun 25, 21:59 UTCJun 25, 22:34 UTC35m
2026-06-25 N1784Q - Jun 25, 19:44 UTCJun 25, 20:05 UTC20m
2026-06-25 N1784Q - Jun 25, 13:45 UTCJun 25, 14:24 UTC40m
2026-06-23 N1784Q - Jun 23, 22:55 UTCJun 23, 23:59 UTC1h 5m
2026-06-22 N1784Q - Jun 22, 17:15 UTCJun 22, 17:40 UTC25m
2026-06-21 N1784Q - Jun 21, 16:44 UTCJun 21, 18:04 UTC1h 20m
2026-06-21 N1784Q - Jun 21, 03:44 UTCJun 21, 04:10 UTC25m
2026-06-20 N1784Q - Jun 20, 23:55 UTCJun 21, 00:55 UTC1h 0m
2026-06-20 N1784Q - Jun 20, 20:34 UTCJun 20, 22:59 UTC2h 25m
2026-06-20 N1784Q - Jun 20, 16:39 UTCJun 20, 17:59 UTC1h 20m
2026-06-19 N1784Q - Jun 19, 19:54 UTCJun 19, 20:34 UTC40m
2026-06-19 N1784Q - Jun 19, 15:44 UTCJun 19, 17:55 UTC2h 10m
2026-06-17 N1784Q - Jun 17, 23:40 UTCJun 18, 00:25 UTC45m
2026-06-17 N1784Q - Jun 17, 20:20 UTCJun 17, 21:05 UTC45m
2026-06-15 N1784Q - Jun 15, 22:20 UTCJun 15, 23:04 UTC45m
2026-06-14 N1784Q - Jun 14, 12:50 UTCJun 14, 13:35 UTC45m
2026-06-13 N1784Q - Jun 13, 23:30 UTCJun 14, 00:00 UTC30m
2026-06-13 N1784Q - Jun 13, 21:25 UTCJun 13, 21:35 UTC10m
2026-06-13 N1784Q - Jun 13, 19:05 UTCJun 13, 19:50 UTC45m
2026-06-13 N1784Q - Jun 13, 17:00 UTCJun 13, 17:30 UTC30m
2026-06-13 N1784Q - Jun 13, 14:00 UTCJun 13, 15:50 UTC1h 50m
2026-06-11 N1784Q - Jun 11, 14:15 UTCJun 11, 15:20 UTC1h 5m
2026-06-10 N1784Q - Jun 10, 20:40 UTCJun 10, 20:50 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 N1784Q page for operator, model, and routing details .

Mode-S A139D8 frequently asked

What is Mode-S code A139D8?
A139D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1784Q.
Where is Mode-S A139D8 registered?
Mode-S code A139D8 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 A139D8 broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A139D8, octal 50234730, decimal 10,566,104.
What flights does A139D8 operate?
Mode-S A139D8 has broadcast 1 distinct callsign, including N1784Q.