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sensors Mode-S transponder

AD937C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N974LA · operated by TEXTRON AVIATION INC

Hex
AD937C
Octal
53311574
Decimal
11,375,484
Country
US
Tail
N974LA
Type
C408
No current signal · last broadcast Jul 26, 20:30 UTC
Flights observed
446
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

Last known position

Most recent position reported by Mode-S AD937C.

Country allocation

The ICAO 24-bit address AD937C 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 20 distinct

Callsign Airline Flights Last seen
STT807 Air St. Thomas 31 2026-07-26
STT426 Air St. Thomas 31 2026-07-24
STT811 Air St. Thomas 29 2026-07-26
STT406 Air St. Thomas 29 2026-07-26
STT420 Air St. Thomas 27 2026-07-25
STT410 Air St. Thomas 27 2026-07-25
STT414 Air St. Thomas 26 2026-07-24
STT422 - 25 2026-07-10
STT823 - 22 2026-07-10
STT416 - 22 2026-07-09
STT430 Air St. Thomas 21 2026-07-25
STT831 - 20 2026-07-18
STT817 - 20 2026-07-09
STT813 - 20 2026-07-09
STT412 - 20 2026-07-09
STT827 Air St. Thomas 19 2026-07-25
STT821 Air St. Thomas 17 2026-07-25
STT815 Air St. Thomas 16 2026-07-25
STT934 - 6 2026-07-18
STT932 Air St. Thomas 5 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 STT811 LNY → HNL Jul 26, 19:15 UTCJul 26, 20:30 UTC1h 15m
2026-07-26 STT807 LNY → HNL Jul 26, 18:00 UTCJul 26, 18:25 UTC25m
2026-07-26 STT406 HNL → LNY Jul 26, 16:55 UTCJul 26, 17:15 UTC20m
2026-07-25 STT815 LNY → HNL Jul 25, 20:55 UTCJul 25, 22:05 UTC1h 10m
2026-07-25 STT811 LNY → HNL Jul 25, 19:55 UTCJul 25, 20:15 UTC20m
2026-07-25 STT410 HNL → LNY Jul 25, 19:00 UTCJul 25, 19:20 UTC20m
2026-07-25 STT807 LNY → HNL Jul 25, 17:55 UTCJul 25, 18:15 UTC20m
2026-07-25 STT406 - Jul 25, 16:55 UTCJul 25, 17:20 UTC25m
2026-07-25 STT430 HNL → LNY Jul 25, 05:10 UTCJul 25, 06:15 UTC1h 5m
2026-07-25 STT827 LNY → HNL Jul 25, 03:10 UTCJul 25, 04:25 UTC1h 15m
2026-07-25 STT821 LNY → HNL Jul 25, 01:05 UTCJul 25, 01:25 UTC20m
2026-07-25 STT420 HNL → LNY Jul 25, 00:15 UTCJul 25, 00:35 UTC20m
2026-07-24 STT414 HNL → LNY Jul 24, 21:25 UTCJul 24, 22:30 UTC1h 5m
2026-07-24 STT410 - Jul 24, 19:10 UTCJul 24, 20:25 UTC1h 15m
2026-07-24 STT807 - Jul 24, 18:00 UTCJul 24, 18:25 UTC25m
2026-07-24 STT406 - Jul 24, 17:05 UTCJul 24, 17:25 UTC20m
2026-07-24 STT430 HNL → LNY Jul 24, 05:10 UTCJul 24, 06:10 UTC1h 0m
2026-07-24 STT827 LNY → HNL Jul 24, 04:10 UTCJul 24, 04:30 UTC20m
2026-07-24 STT426 HNL → LNY Jul 24, 03:05 UTCJul 24, 03:25 UTC20m
2026-07-24 STT821 LNY → HNL Jul 24, 01:00 UTCJul 24, 01:30 UTC30m
2026-07-24 STT420 HNL → LNY Jul 24, 00:05 UTCJul 24, 00:30 UTC25m
2026-07-23 STT414 - Jul 23, 21:15 UTCJul 23, 22:25 UTC1h 10m
2026-07-23 STT811 - Jul 23, 20:10 UTCJul 23, 20:35 UTC25m
2026-07-23 STT410 - Jul 23, 19:05 UTCJul 23, 19:25 UTC20m
2026-07-23 STT807 - Jul 23, 17:55 UTCJul 23, 18:15 UTC20m
2026-07-23 STT406 - Jul 23, 17:00 UTCJul 23, 17:25 UTC25m
2026-07-23 STT430 HNL → LNY Jul 23, 05:00 UTCJul 23, 06:05 UTC1h 5m
2026-07-23 STT827 LNY → HNL Jul 23, 04:00 UTCJul 23, 04:20 UTC20m
2026-07-23 STT426 HNL → LNY Jul 23, 03:00 UTCJul 23, 03:20 UTC20m
2026-07-23 STT420 HNL → LNY Jul 23, 00:05 UTCJul 23, 01:10 UTC1h 5m
2026-07-22 STT815 LNY → HNL Jul 22, 22:05 UTCJul 22, 22:25 UTC20m
2026-07-22 STT414 - Jul 22, 21:00 UTCJul 22, 21:20 UTC20m
2026-07-22 STT811 - Jul 22, 19:55 UTCJul 22, 20:20 UTC25m
2026-07-22 STT410 - Jul 22, 19:00 UTCJul 22, 19:20 UTC20m
2026-07-22 STT406 - Jul 22, 17:10 UTCJul 22, 18:15 UTC1h 5m
2026-07-22 STT426 HNL → LNY Jul 22, 03:05 UTCJul 22, 05:10 UTC2h 5m
2026-07-22 STT821 LNY → HNL Jul 22, 00:10 UTCJul 22, 01:30 UTC1h 20m
2026-07-21 STT815 - Jul 21, 22:10 UTCJul 21, 22:35 UTC25m
2026-07-21 STT414 - Jul 21, 21:20 UTCJul 21, 21:40 UTC20m
2026-07-21 STT811 - Jul 21, 19:00 UTCJul 21, 20:15 UTC1h 15m
2026-07-21 STT807 - Jul 21, 17:15 UTCJul 21, 18:25 UTC1h 10m
2026-07-21 STT430 HNL → LNY Jul 21, 05:15 UTCJul 21, 06:15 UTC1h 0m
2026-07-21 STT426 HNL → LNY Jul 21, 03:10 UTCJul 21, 04:15 UTC1h 5m
2026-07-21 STT420 HNL → LNY Jul 21, 00:05 UTCJul 21, 01:10 UTC1h 5m
2026-07-20 STT414 - Jul 20, 21:15 UTCJul 20, 22:20 UTC1h 5m
2026-07-20 STT410 - Jul 20, 19:15 UTCJul 20, 20:20 UTC1h 5m
2026-07-20 STT807 - Jul 20, 18:15 UTCJul 20, 18:40 UTC25m
2026-07-20 STT406 - Jul 20, 17:20 UTCJul 20, 17:40 UTC20m
2026-07-20 STT430 - Jul 20, 05:00 UTCJul 20, 06:10 UTC1h 10m
2026-07-20 STT827 - Jul 20, 03:55 UTCJul 20, 04:15 UTC20m

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 N974LA page for operator, model, and routing details .

Mode-S AD937C frequently asked

What is Mode-S code AD937C?
AD937C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N974LA.
Where is Mode-S AD937C registered?
Mode-S code AD937C 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 AD937C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD937C, octal 53311574, decimal 11,375,484.
What flights does AD937C operate?
Mode-S AD937C has broadcast 20 distinct callsigns, including STT807, STT426, STT811, STT406, STT420.