Apparatus

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sensors Mode-S transponder

A137B9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N178JM · CESSNA T182 Turbo Skylane · operated by DCD AVIATION LLC

Hex
A137B9
Octal
50233671
Decimal
10,565,561
Country
US
Tail
N178JM
Type
C82S
No current signal · last broadcast Jul 14, 04:10 UTC
Flights observed
23
Distinct callsigns
1
Country
US
Last broadcast
Jul 14, 04:10 UTC

Last known position

Most recent position reported by Mode-S A137B9.

Country allocation

The ICAO 24-bit address A137B9 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
N178JM - 23 2026-07-14

Recent flights last 23

DateFlightRouteTakeoffLandingDuration
2026-07-14 N178JM - Jul 14, 03:20 UTCJul 14, 04:10 UTC50m
2026-07-10 N178JM - Jul 10, 20:10 UTCJul 10, 21:05 UTC55m
2026-07-06 N178JM - Jul 6, 02:10 UTCJul 6, 02:55 UTC45m
2026-07-02 N178JM - Jul 2, 21:05 UTCJul 2, 22:00 UTC55m
2026-06-22 N178JM - Jun 22, 01:25 UTCJun 22, 02:10 UTC45m
2026-06-18 N178JM - Jun 18, 23:05 UTCJun 18, 23:50 UTC45m
2026-06-18 N178JM - Jun 18, 18:45 UTCJun 18, 20:05 UTC1h 20m
2026-06-14 N178JM - Jun 14, 18:05 UTCJun 14, 18:50 UTC45m
2026-06-12 N178JM - Jun 12, 14:55 UTCJun 12, 16:00 UTC1h 5m
2026-06-07 N178JM - Jun 7, 19:00 UTCJun 7, 19:45 UTC45m
2026-06-04 N178JM - Jun 4, 20:05 UTCJun 4, 20:55 UTC50m
2026-06-01 N178JM - Jun 1, 01:15 UTCJun 1, 02:05 UTC50m
2026-05-28 N178JM - May 28, 22:50 UTCMay 28, 23:40 UTC50m
2026-05-27 N178JM - May 27, 22:45 UTCMay 27, 23:30 UTC45m
2026-05-27 N178JM - May 27, 19:15 UTCMay 27, 20:15 UTC1h 0m
2026-05-26 N178JM - May 26, 02:15 UTCMay 26, 03:00 UTC45m
2026-05-22 N178JM - May 22, 23:15 UTCMay 23, 00:05 UTC50m
2026-05-04 N178JM - May 4, 01:44 UTCMay 4, 02:30 UTC45m
2026-04-30 N178JM - Apr 30, 21:00 UTCApr 30, 21:45 UTC45m
2026-04-30 N178JM - Apr 30, 18:30 UTCApr 30, 19:40 UTC1h 10m
2026-04-19 N178JM - Apr 19, 01:00 UTCApr 19, 01:50 UTC50m
2026-04-18 N178JM - Apr 18, 03:25 UTCApr 18, 04:05 UTC40m
2026-04-18 N178JM - Apr 18, 03:05 UTCApr 18, 03:20 UTC15m

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 N178JM page for operator, model, and routing details .

Mode-S A137B9 frequently asked

What is Mode-S code A137B9?
A137B9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N178JM.
Where is Mode-S A137B9 registered?
Mode-S code A137B9 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 A137B9 broadcasting right now?
No active broadcast right now. Last signal was Jul 14, 04:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A137B9, octal 50233671, decimal 10,565,561.
What flights does A137B9 operate?
Mode-S A137B9 has broadcast 1 distinct callsign, including N178JM.